diff --git a/Pipfile.lock b/Pipfile.lock
index 6eb67fd..470a7d2 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -16,112 +16,97 @@
     "default": {
         "numpy": {
             "hashes": [
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-                "sha256:378378973546ecc1dfaf9e24c160d683dd04df871ecd2dcc86ce658ca20f92c0",
-                "sha256:419e6faee16097124ee627ed31572c7e80a1070efa25260b78097cca240e219a",
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-                "sha256:5ee7f3dbbdba0da75dec7e94bd7a2b10fe57a83e1b38e678200a6ad8e7b14fdc",
-                "sha256:62d55e96ec7b117d3d5e618c15efcf769e70a6effaee5842857b64fb4883887a",
-                "sha256:719b6789acb2bc86ea9b33a701d7c43dc2fc56d95107fd3c5b0a8230164d4dfb",
-                "sha256:7a70f2b60d48828cba94a54a8776b61a9c2657a803d47f5785f8062e3a9c7c55",
-                "sha256:7b9e37f194f8bcdca8e9e6af92e2cbad79e360542effc2dd6b98d63955d8d8a3",
-                "sha256:83b8fc18261b70f45bece2d392537c93dc81eb6c539a16c9ac994c47fc79f09a",
-                "sha256:9473ad28375710ab18378e72b59422399b27e957e9339c413bf00793b4b12df0",
-                "sha256:95b085b253080e5d09f7826f5e27dce067bae813a132023a77b739614a29de6e",
-                "sha256:98b86c62c08c2e5dc98a9c856d4a95329d11b1c6058cb9b5191d5ea6891acd09",
-                "sha256:a3bd01d6d3ed3d7c06d7f9979ba5d68281f15383fafd53b81aa44b9191047cf8",
-                "sha256:c81a6afc1d2531a9ada50b58f8c36197f8418ef3d0611d4c1d7af93fdcda764f",
-                "sha256:ce75ed495a746e3e78cfa22a77096b3bff2eda995616cb7a542047f233091268",
-                "sha256:dae8618c0bcbfcf6cf91350f8abcdd84158323711566a8c5892b5c7f832af76f",
-                "sha256:df0b02c6705c5d1c25cc35c7b5d6b6f9b3b30833f9d178843397ae55ecc2eebb",
-                "sha256:e3660744cda0d94b90141cdd0db9308b958a372cfeee8d7188fdf5ad9108ea82",
-                "sha256:f2362d0ca3e16c37782c1054d7972b8ad2729169567e3f0f4e5dd3cdf85f188e"
+                "sha256:0cfe07133fd00b27edee5e6385e333e9eeb010607e8a46e1cd673f05f8596595",
+                "sha256:11a1f3816ea82eed4178102c56281782690ab5993251fdfd75039aad4d20385f",
+                "sha256:2762331de395739c91f1abb88041f94a080cb1143aeec791b3b223976228af3f",
+                "sha256:283d9de87c0133ef98f93dfc09fad3fb382f2a15580de75c02b5bb36a5a159a5",
+                "sha256:3d22662b4b10112c545c91a0741f2436f8ca979ab3d69d03d19322aa970f9695",
+                "sha256:41388e32e40b41dd56eb37fcaa7488b2b47b0adf77c66154d6b89622c110dfe9",
+                "sha256:42c16cec1c8cf2728f1d539bd55aaa9d6bb48a7de2f41eb944697293ef65a559",
+                "sha256:47ee7a839f5885bc0c63a74aabb91f6f40d7d7b639253768c4199b37aede7982",
+                "sha256:5a311ee4d983c487a0ab546708edbdd759393a3dc9cd30305170149fedd23c88",
+                "sha256:5dc65644f75a4c2970f21394ad8bea1a844104f0fe01f278631be1c7eae27226",
+                "sha256:6ed0d073a9c54ac40c41a9c2d53fcc3d4d4ed607670b9e7b0de1ba13b4cbfe6f",
+                "sha256:76ba7c40e80f9dc815c5e896330700fd6e20814e69da9c1267d65a4d051080f1",
+                "sha256:818b9be7900e8dc23e013a92779135623476f44a0de58b40c32a15368c01d471",
+                "sha256:a024181d7aef0004d76fb3bce2a4c9f2e67a609a9e2a6ff2571d30e9976aa383",
+                "sha256:a955e4128ac36797aaffd49ab44ec74a71c11d6938df83b1285492d277db5397",
+                "sha256:a97a954a8c2f046d3817c2bce16e3c7e9a9c2afffaf0400f5c16df5172a67c9c",
+                "sha256:a97e82c39d9856fe7d4f9b86d8a1e66eff99cf3a8b7ba48202f659703d27c46f",
+                "sha256:b55b953a1bdb465f4dc181758570d321db4ac23005f90ffd2b434cc6609a63dd",
+                "sha256:bb02929b0d6bfab4c48a79bd805bd7419114606947ec8284476167415171f55b",
+                "sha256:bece0a4a49e60e472a6d1f70ac6cdea00f9ab80ff01132f96bd970cdd8a9e5a9",
+                "sha256:e41e8951749c4b5c9a2dc5fdbc1a4eec6ab2a140fdae9b460b0f557eed870f4d",
+                "sha256:f71d57cc8645f14816ae249407d309be250ad8de93ef61d9709b45a0ddf4050c"
             ],
             "index": "pypi",
-            "version": "==1.15.1"
+            "version": "==1.22.0"
         }
     },
     "develop": {
-        "apipkg": {
-            "hashes": [
-                "sha256:37228cda29411948b422fae072f57e31d3396d2ee1c9783775980ee9c9990af6",
-                "sha256:58587dd4dc3daefad0487f6d9ae32b4542b185e1c36db6993290e7c41ca2b47c"
-            ],
-            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
-            "version": "==1.5"
-        },
         "atomicwrites": {
             "hashes": [
-                "sha256:0312ad34fcad8fac3704d441f7b317e50af620823353ec657a53e981f92920c0",
-                "sha256:ec9ae8adaae229e4f8446952d204a3e4b5fdd2d099f9be3aaf556120135fb3ee"
+                "sha256:6d1784dea7c0c8d4a5172b6c620f40b6e4cbfdf96d783691f2e1302a7b88e197",
+                "sha256:ae70396ad1a434f9c7046fd2dd196fc04b12f9e91ffb859164193be8b6168a7a"
             ],
-            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
-            "version": "==1.2.1"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.4.0"
         },
         "attrs": {
             "hashes": [
-                "sha256:10cbf6e27dbce8c30807caf056c8eb50917e0eaafe86347671b57254006c3e69",
-                "sha256:ca4be454458f9dec299268d472aaa5a11f67a4ff70093396e1ceae9c76cf4bbb"
+                "sha256:2d27e3784d7a565d36ab851fe94887c5eccd6a463168875832a1be79c82828b4",
+                "sha256:626ba8234211db98e869df76230a137c4c40a12d72445c45d5f5b716f076e2fd"
             ],
-            "version": "==18.2.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==21.4.0"
         },
         "execnet": {
             "hashes": [
-                "sha256:a7a84d5fa07a089186a329528f127c9d73b9de57f1a1131b82bb5320ee651f6a",
-                "sha256:fc155a6b553c66c838d1a22dba1dc9f5f505c43285a878c6f74a79c024750b83"
+                "sha256:8f694f3ba9cc92cab508b152dcfe322153975c29bda272e2fd7f3f00f36e47c5",
+                "sha256:a295f7cc774947aac58dde7fdc85f4aa00c42adf5d8f5468fc630c1acf30a142"
             ],
-            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
-            "version": "==1.5.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==1.9.0"
         },
         "funcsigs": {
             "hashes": [
                 "sha256:330cc27ccbf7f1e992e69fef78261dc7c6569012cf397db8d3de0234e6c937ca",
                 "sha256:a7bb0f2cf3a3fd1ab2732cb49eba4252c2af4240442415b4abce3b87022a8f50"
             ],
-            "index": "pypi",
             "markers": "python_version < '3.3.0'",
             "version": "==1.0.2"
         },
         "more-itertools": {
             "hashes": [
-                "sha256:c187a73da93e7a8acc0001572aebc7e3c69daf7bf6881a2cea10650bd4420092",
-                "sha256:c476b5d3a34e12d40130bc2f935028b5f636df8f372dc2c1c01dc19681b2039e",
-                "sha256:fcbfeaea0be121980e15bc97b3817b5202ca73d0eae185b4550cbfce2a3ebb3d"
+                "sha256:a42901a0a5b169d925f6f217cd5a190e32ef54360905b9c39ee7db5313bfec0f",
+                "sha256:c5122bffc5f104d37c1626b8615b511f3427aa5389b94d61e5ef8236bfbc3ddb"
             ],
-            "version": "==4.3.0"
+            "markers": "python_version >= '3.5'",
+            "version": "==8.13.0"
         },
         "pathlib2": {
             "hashes": [
                 "sha256:8eb170f8d0d61825e09a95b38be068299ddeda82f35e96c3301a8a5e7604cb83",
                 "sha256:d1aa2a11ba7b8f7b21ab852b1fb5afb277e1bb99d5dfc663380b5015c0d80c5a"
             ],
-            "index": "pypi",
             "markers": "python_version < '3.6.0'",
             "version": "==2.3.2"
         },
         "pluggy": {
             "hashes": [
-                "sha256:6e3836e39f4d36ae72840833db137f7b7d35105079aee6ec4a62d9f80d594dd1",
-                "sha256:95eb8364a4708392bae89035f45341871286a333f749c3141c20573d2b3876e1"
+                "sha256:4224373bacce55f955a878bf9cfa763c1e360858e330072059e10bad68531159",
+                "sha256:74134bbf457f031a36d68416e1509f34bd5ccc019f0bcc952c7b909d06b37bd3"
             ],
-            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
-            "version": "==0.7.1"
+            "markers": "python_version >= '3.6'",
+            "version": "==1.0.0"
         },
         "py": {
             "hashes": [
-                "sha256:06a30435d058473046be836d3fc4f27167fd84c45b99704f2fb5509ef61f9af1",
-                "sha256:50402e9d1c9005d759426988a492e0edaadb7f4e68bcddfea586bc7432d009c6"
+                "sha256:51c75c4126074b472f746a24399ad32f6053d1b34b68d2fa41e558e6f4a98719",
+                "sha256:607c53218732647dff4acdfcd50cb62615cedf612e72d1724fb1a0cc6405b378"
             ],
-            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
-            "version": "==1.6.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==1.11.0"
         },
         "pytest": {
             "hashes": [
@@ -133,10 +118,11 @@
         },
         "pytest-forked": {
             "hashes": [
-                "sha256:e4500cd0509ec4a26535f7d4112a8cc0f17d3a41c29ffd4eab479d2a55b30805",
-                "sha256:f275cb48a73fc61a6710726348e1da6d68a978f0ec0c54ece5a5fae5977e5a08"
+                "sha256:42a438336731465c5bd76ab38e1645647ac55914a08b507efbabe8783a08aa6c",
+                "sha256:65f96334863d9cbe53d21f73e8febc4dd61b8d1fdcac7b487d9af07a5d02a938"
             ],
-            "version": "==0.2"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4'",
+            "version": "==1.2.0"
         },
         "pytest-xdist": {
             "hashes": [
@@ -146,29 +132,21 @@
             "index": "pypi",
             "version": "==1.23.0"
         },
-        "scandir": {
+        "setuptools": {
             "hashes": [
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-                "sha256:f5c71e29b4e2af7ccdc03a020c626ede51da471173b4a6ad1e904f2b2e04b4bd"
+                "sha256:990a4f7861b31532871ab72331e755b5f14efbe52d336ea7f6118144dd478741",
+                "sha256:c1848f654aea2e3526d17fc3ce6aeaa5e7e24e66e645b5be2171f3f6b4e5a178"
             ],
-            "markers": "python_version < '3.5'",
-            "version": "==1.9.0"
+            "markers": "python_version >= '3.7'",
+            "version": "==62.6.0"
         },
         "six": {
             "hashes": [
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-                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
+                "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
+                "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "version": "==1.11.0"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
+            "version": "==1.16.0"
         }
     }
 }