.travis.yml in act-fluent-logger-rails-0.5.0 vs .travis.yml in act-fluent-logger-rails-0.6.0

@@ -1,30 +1,47 @@
 language: ruby
+before_install:
+  - gem uninstall -v '>= 2' -i $(rvm gemdir)@global -ax bundler || true
+  - gem install bundler -v '< 2'
 rvm:
   - 2.1.10
   - 2.2.10
-  - 2.3.7
-  - 2.4.4
-  - 2.5.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - 2.6.1
 gemfile:
   - gemfiles/rails_4.0.gemfile
   - gemfiles/rails_4.1.gemfile
   - gemfiles/rails_4.2.gemfile
   - gemfiles/rails_5.0.gemfile
   - gemfiles/rails_5.1.gemfile
   - gemfiles/rails_5.2.gemfile
+  - gemfiles/rails_6.0.gemfile
 matrix:
   exclude:
     - rvm: 2.1.10
       gemfile: gemfiles/rails_5.0.gemfile
     - rvm: 2.1.10
       gemfile: gemfiles/rails_5.1.gemfile
     - rvm: 2.1.10
       gemfile: gemfiles/rails_5.2.gemfile
-    - rvm: 2.4.4
+    - rvm: 2.1.10
+      gemfile: gemfiles/rails_6.0.gemfile
+    - rvm: 2.2.10
+      gemfile: gemfiles/rails_6.0.gemfile
+    - rvm: 2.3.8
+      gemfile: gemfiles/rails_6.0.gemfile
+    - rvm: 2.4.5
       gemfile: gemfiles/rails_4.0.gemfile
-    - rvm: 2.4.4
+    - rvm: 2.4.5
       gemfile: gemfiles/rails_4.1.gemfile
-    - rvm: 2.5.1
+    - rvm: 2.4.5
+      gemfile: gemfiles/rails_6.0.gemfile
+    - rvm: 2.5.3
       gemfile: gemfiles/rails_4.0.gemfile
-    - rvm: 2.5.1
+    - rvm: 2.5.3
+      gemfile: gemfiles/rails_4.1.gemfile
+    - rvm: 2.6.1
+      gemfile: gemfiles/rails_4.0.gemfile
+    - rvm: 2.6.1
       gemfile: gemfiles/rails_4.1.gemfile