Don't test Ruby 2.4 + Rails 4

Author: JasonBarnabe

.travis.yml

@@ -15,6 +15,10 @@ matrix:
   exclude:
     - rvm: 2.1
       gemfile: gemfiles/rails_5.0.gemfile
+    - rvm: 2.4.8
+      gemfile: gemfiles/rails_4.1.gemfile
+    - rvm: 2.4.8
+      gemfile: gemfiles/rails_4.2.gemfile
 
 before_install:
   - if ruby --version | cut -d ' ' -f 2 | grep -q 2.1.5p273 ; then gem update --system 2.4.8; fi