Merge branch 'release/v3.0.3'

Author: lokielse

composer.json

@@ -30,11 +30,11 @@
     }
   },
   "require": {
-    "omnipay/common": "v3.0-beta.1",
+    "omnipay/common": "^3.0",
     "php-http/guzzle6-adapter": "*"
   },
   "require-dev": {
-    "omnipay/tests": "v3.0-beta.1",
+    "omnipay/tests": "^3.0",
     "squizlabs/php_codesniffer": "3.*"
   }
 }