add community to authors

Author: ofbeaton

composer.json

@@ -12,6 +12,10 @@
             "name": "Steven Maguire",
             "email": "stevenmaguire@gmail.com",
             "homepage": "https://github.com/stevenmaguire"
+        },
+        {
+            "name": "oauth2-phabricator Community",
+            "homepage": "https://github.com/ofbeaton/oauth2-phabricator/graphs/contributors"
         }
     ],
     "keywords": [