Merge pull request #9 from vimeo/update-dependencies

Updating `guzzlehttp/guzzle` to ^6.5|^7.8 and `omnipay/common` to ^3.0

Author: MelechMizrachi

composer.json

@@ -16,9 +16,9 @@
         }
     },
     "require": {
-        "guzzlehttp/guzzle": "^6.5",
+        "guzzlehttp/guzzle": "^6.5|^7.8",
         "psr/log": "^1.0",
-        "omnipay/common": "3.0"
+        "omnipay/common": "^3.0"
     },
     "require-dev": {
         "omnipay/tests": "3.0"