.travis.yml in api-auth-2.1.0 vs .travis.yml in api-auth-2.2.0

@@ -1,66 +1,35 @@
 language: ruby
 sudo: false
 cache: bundler
 rvm:
-  - 1.8.7-p374
-  - 1.9.3
   - 2.1.9
-  - 2.2.5
-  - 2.3.1
+  - 2.2.6
+  - 2.3.3
+  - 2.4.1
 gemfile:
-  - gemfiles/rails_23.gemfile
-  - gemfiles/rails_30.gemfile
-  - gemfiles/rails_31.gemfile
-  - gemfiles/rails_32.gemfile
   - gemfiles/rails_4.gemfile
   - gemfiles/rails_41.gemfile
   - gemfiles/rails_42.gemfile
   - gemfiles/rails_5.gemfile
+  - gemfiles/rails_51.gemfile
 env:
   - TEST_SUITE=rake
 
+before_install:
+  - gem update bundler
+
 script:
   - bundle exec $TEST_SUITE
 
 matrix:
   exclude:
-    - rvm: 1.8.7-p374
-      gemfile: gemfiles/rails_4.gemfile
-    - rvm: 1.8.7-p374
-      gemfile: gemfiles/rails_41.gemfile
-    - rvm: 1.8.7-p374
-      gemfile: gemfiles/rails_42.gemfile
-    - rvm: 1.8.7-p374
-      gemfile: gemfiles/rails_5.gemfile
-    - rvm: 1.9.3
-      gemfile: gemfiles/rails_5.gemfile
     - rvm: 2.1.9
-      gemfile: gemfiles/rails_23.gemfile
-    - rvm: 2.1.9
-      gemfile: gemfiles/rails_30.gemfile
-    - rvm: 2.1.9
-      gemfile: gemfiles/rails_31.gemfile
-    - rvm: 2.1.9
       gemfile: gemfiles/rails_5.gemfile
-    - rvm: 2.2.5
-      gemfile: gemfiles/rails_23.gemfile
-    - rvm: 2.2.5
-      gemfile: gemfiles/rails_30.gemfile
-    - rvm: 2.2.5
-      gemfile: gemfiles/rails_31.gemfile
-    - rvm: 2.2.5
-      gemfile: gemfiles/rails_32.gemfile
-    - rvm: 2.3.1
-      gemfile: gemfiles/rails_23.gemfile
-    - rvm: 2.3.1
-      gemfile: gemfiles/rails_30.gemfile
-    - rvm: 2.3.1
-      gemfile: gemfiles/rails_31.gemfile
-    - rvm: 2.3.1
-      gemfile: gemfiles/rails_32.gemfile
+    - rvm: 2.1.9
+      gemfile: gemfiles/rails_51.gemfile
   include:
-    - rvm: 2.3.1
+    - rvm: 2.4.1
       gemfile: gemfiles/rails_5.gemfile
       env: TEST_SUITE="rubocop lib/ spec/"
 
 notifications:
   email: false