Merge branch 'release/1.0.1'

Author: mwr

composer.json

@@ -16,10 +16,10 @@
     "require": {
         "php": "~7.0.0|~7.1.0|~7.2.0",
         "ext-json": "*",
-        "guzzlehttp/guzzle": "^6.3",
-        "symfony/serializer": "^3.3.0",
-        "symfony/property-info": "^3.4.0",
-        "symfony/property-access": "^3.4.0"
+        "guzzlehttp/guzzle": "~6.3",
+        "symfony/serializer": "~3.3|~4.0",
+        "symfony/property-info": "~3.4.0|~4.0",
+        "symfony/property-access": "~3.4|~4.0"
     },
     "autoload": {
         "psr-4": {