[FIX] v3 beta.1

Author: lokielse

composer.json

@@ -29,11 +29,11 @@
     ]
   },
   "require": {
-    "omnipay/common": "3.0.x-dev",
+    "omnipay/common": "v3.0-beta.1",
     "php-http/guzzle6-adapter": "*"
   },
   "require-dev": {
-    "omnipay/tests": "3.0.x-dev",
+    "omnipay/tests": "v3.0-beta.1",
     "squizlabs/php_codesniffer": "3.*"
   }
 }