.travis.yml in api-auth-2.3.1 vs .travis.yml in api-auth-2.4.0

@@ -3,17 +3,16 @@
 cache: bundler
 rvm:
   - 2.3.6
   - 2.4.3
   - 2.5.3
+  - 2.6.1
 gemfile:
-  - gemfiles/rails_4.gemfile
-  - gemfiles/rails_41.gemfile
-  - gemfiles/rails_42.gemfile
   - gemfiles/rails_5.gemfile
   - gemfiles/rails_51.gemfile
   - gemfiles/rails_52.gemfile
+  - gemfiles/rails_60.gemfile
   - gemfiles/http2.gemfile
   - gemfiles/http3.gemfile
   - gemfiles/http4.gemfile
 env:
   - TEST_SUITE=rake
@@ -24,11 +23,17 @@
 script:
   - bundle exec $TEST_SUITE
 
 matrix:
   include:
-    - rvm: 2.5.3
-      gemfile: gemfiles/rails_5.gemfile
+    - rvm: 2.6.1
+      gemfile: gemfiles/rails_60.gemfile
       env: TEST_SUITE="rubocop lib/ spec/"
+  exclude:
+    - rvm: 2.3.6
+      gemfile: gemfiles/rails_60.gemfile
+    - rvm: 2.4.3
+      gemfile: gemfiles/rails_60.gemfile
+      env: TEST_SUITE=rake
 
 notifications:
   email: false