Add some more excludes since rails 5 only likes new ruby

Author: chris-hut

.travis.yml

@@ -17,11 +17,19 @@ matrix:
   exclude:
     - rvm: 1.9.3
       gemfile: spec/gemfiles/rails-4.0.x.gemfile
+    - rvm: 1.9.3
+      gemfile: spec/gemfiles/rails-5.0.x.gemfile
     - rvm: 1.9.3
       gemfile: spec/gemfiles/rails-4.1.x.gemfile
+    - rvm: 1.9.3
+      gemfile: spec/gemfiles/rails-5.0.x.gemfile
     - rvm: 1.9.3
       gemfile: spec/gemfiles/rails-4.2.x.gemfile
-    - rvm: 2.3.7
+    - rvm: 2.0.0
+      gemfile: spec/gemfiles/rails-5.0.x.gemfile
+    - rvm: 2.1.5
+      gemfile: spec/gemfiles/rails-5.0.x.gemfile
+    - rvm: 2.2.2
       gemfile: spec/gemfiles/rails-5.0.x.gemfile
     - rvm: jruby-19mode
       gemfile: spec/gemfiles/Gemfile.rails-3.2.x