.travis.yml in identity_cache-0.3.1 vs .travis.yml in identity_cache-0.3.2

@@ -3,12 +3,18 @@
 rvm:
   - 2.1
   - 2.2.3
 
 gemfile:
-  - Gemfile.rails40
-  - Gemfile.rails41
   - Gemfile.rails42
+  - Gemfile.rails50
+
+matrix:
+  exclude:
+    - rvm: 2.1
+      gemfile: Gemfile.rails50
+    - gemfile: Gemfile.rails50
+      env: DB=postgresql
 
 env:
   - DB=mysql2
   - DB=postgresql