dependency: add babel-core to devDependencies

Author: fengzilong

package.json

@@ -65,6 +65,7 @@
   },
   "devDependencies": {
     "ava": "^0.25.0",
+    "babel-core": "^6.0.0",
     "babel-loader": "^6.2.4",
     "babel-plugin-transform-runtime": "^6.9.0",
     "babel-preset-es2015": "^6.24.1",

yarn.lock

@@ -478,6 +478,30 @@ babel-code-frame@^6.16.0, babel-code-frame@^6.22.0, babel-code-frame@^6.26.0:
     esutils "^2.0.2"
     js-tokens "^3.0.2"
 
+babel-core@^6.0.0:
+  version "6.26.3"
+  resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.26.3.tgz#b2e2f09e342d0f0c88e2f02e067794125e75c207"
+  dependencies:
+    babel-code-frame "^6.26.0"
+    babel-generator "^6.26.0"
+    babel-helpers "^6.24.1"
+    babel-messages "^6.23.0"
+    babel-register "^6.26.0"
+    babel-runtime "^6.26.0"
+    babel-template "^6.26.0"
+    babel-traverse "^6.26.0"
+    babel-types "^6.26.0"
+    babylon "^6.18.0"
+    convert-source-map "^1.5.1"
+    debug "^2.6.9"
+    json5 "^0.5.1"
+    lodash "^4.17.4"
+    minimatch "^3.0.4"
+    path-is-absolute "^1.0.1"
+    private "^0.1.8"
+    slash "^1.0.0"
+    source-map "^0.5.7"
+
 babel-core@^6.17.0, babel-core@^6.26.0:
   version "6.26.0"
   resolved "https://registry.yarnpkg.com/babel-core/-/babel-core-6.26.0.tgz#af32f78b31a6fcef119c87b0fd8d9753f03a0bb8"
@@ -1879,7 +1903,7 @@ date-time@^2.1.0:
   dependencies:
     time-zone "^1.0.0"
 
-debug@^2.1.1, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8:
+debug@^2.1.1, debug@^2.2.0, debug@^2.3.3, debug@^2.6.8, debug@^2.6.9:
   version "2.6.9"
   resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.9.tgz#5d128515df134ff327e90a4c93f4e077a536341f"
   dependencies:
@@ -5204,7 +5228,7 @@ pretty-ms@^3.0.0:
     parse-ms "^1.0.0"
     plur "^2.1.2"
 
-private@^0.1.6, private@^0.1.7, private@~0.1.5:
+private@^0.1.6, private@^0.1.7, private@^0.1.8, private@~0.1.5:
   version "0.1.8"
   resolved "https://registry.yarnpkg.com/private/-/private-0.1.8.tgz#2381edb3689f7a53d653190060fcf822d2f368ff"