.travis.yml in maily-0.5.0 vs .travis.yml in maily-0.6.0

@@ -3,24 +3,21 @@
 cache: bundler
 
 sudo: false
 
 rvm:
-  - 2.4.0
-  - 2.3.3
-  - 2.2.6
+  - 2.4.1
+  - 2.3.4
+  - 2.2.7
   - 2.1
 
 gemfile:
+  - gemfiles/rails_5.1.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
+    - rvm: 2.1
+      gemfile: gemfiles/rails_5.1.gemfile