.travis.yml in avromatic-0.6.2 vs .travis.yml in avromatic-0.7.0

@@ -1,5 +1,13 @@
 language: ruby
 rvm:
-  - 2.2.3
-  - 2.3.0
-before_install: gem install bundler -v 1.11.2
+  - 2.2.4
+  - 2.3.1
+gemfile:
+  - gemfiles/rails4_1.gemfile
+  - gemfiles/rails4_2.gemfile
+matrix:
+  exclude:
+  - rvm: 2.2.4
+    gemfile: gemfiles/rails4_2.gemfile
+  - rvm: 2.3.1
+    gemfile: gemfiles/rails4_1.gemfile