minor KnpLabs#1004 Bumped branch alias after new feature merged (GrahamCampbell)

This PR was merged into the 3.2.x-dev branch.

Discussion
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Commits
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4d4cb9c Bumped branch alias after new feature merged

Author: acrobat

composer.json

@@ -52,7 +52,7 @@
     "extra": {
         "branch-alias": {
             "dev-2.x": "2.20.x-dev",
-            "dev-master": "3.2.x-dev"
+            "dev-master": "3.3.x-dev"
         }
     }
 }