.travis.yml in maily-0.4.0 vs .travis.yml in maily-0.5.0

@@ -1,5 +1,26 @@
 language: ruby
+
+cache: bundler
+
+sudo: false
+
 rvm:
+  - 2.4.0
+  - 2.3.3
+  - 2.2.6
   - 2.1
-  - 2.0.0
-  - 1.9.3
+
+gemfile:
+  - gemfiles/rails_5.0.gemfile
+  - gemfiles/rails_4.2.gemfile
+  - gemfiles/rails_4.1.gemfile
+  - gemfiles/rails_3.2.gemfile
+
+matrix:
+  exclude:
+    - rvm: 2.1
+      gemfile: gemfiles/rails_5.0.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_4.1.gemfile
+    - rvm: 2.4.0
+      gemfile: gemfiles/rails_3.2.gemfile
\ No newline at end of file