We should now validate against branch 3.1.x

Author: gn36

.travis.yml

@@ -33,7 +33,7 @@ env:
     - SNIFF="1"            # Should we run code sniffer on your code?
     - IMAGE_ICC="1"        # Should we run icc profile sniffer on your images?
     - EPV="1"              # Should we run EPV (Extension Pre Validator) on your code?
-    - PHPBB_BRANCH="develop-ascraeus"
+    - PHPBB_BRANCH="3.1.x"
 
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