Travis: Test against Ruby 2.6.0

Author: ledermann

.travis.yml

@@ -7,6 +7,7 @@ rvm:
   - 2.3.8
   - 2.4.5
   - 2.5.3
+  - 2.6.0
 gemfile:
   - ci/Gemfile-rails-3-1
   - ci/Gemfile-rails-3-2
@@ -70,6 +71,13 @@ matrix:
       gemfile: ci/Gemfile-rails-4-0
     - rvm: 2.5.3
       gemfile: ci/Gemfile-rails-4-1
+    - rvm: 2.6.0
+      gemfile: ci/Gemfile-rails-3-1
+    - rvm: 2.6.0
+      gemfile: ci/Gemfile-rails-3-2
+    - rvm: 2.6.0
+      gemfile: ci/Gemfile-rails-4-0
+    - rvm: 2.6.0
       gemfile: ci/Gemfile-rails-4-1
 before_install: gem update bundler
 sudo: false