.travis.yml in stateful_enum-0.4.0 vs .travis.yml in stateful_enum-0.5.0

@@ -3,34 +3,42 @@
 sudo: false
 
 cache:
   - apt
   - bundler
+before_install:
+  - gem i bundler -v '<2'
 
-rvm:
-  - 2.2.6
-  - 2.3.3
-  - 2.4.0
-  - ruby-head
-
-gemfile:
-  - gemfiles/Gemfile-rails.4.1.x
-  - gemfiles/Gemfile-rails.4.2.x
-  - gemfiles/Gemfile-rails.5.0.0
-
 addons:
   apt:
     packages:
       - graphviz
 
 matrix:
-  exclude:
-    - rvm: 2.4.0
-      gemfile: gemfiles/Gemfile-rails.4.1.x
-    - rvm: 2.4.0
+  include:
+    - rvm: 2.6.0
+      gemfile: gemfiles/Gemfile-rails.5.2.x
+    - rvm: 2.6.0
+      gemfile: gemfiles/Gemfile-rails.5.1.x
+    - rvm: 2.6.0
+      gemfile: gemfiles/Gemfile-rails.5.0.x
+
+    - rvm: 2.5.3
       gemfile: gemfiles/Gemfile-rails.4.2.x
-    - rvm: ruby-head
+
+    - rvm: 2.3.8
       gemfile: gemfiles/Gemfile-rails.4.1.x
+
+    - rvm: 2.4.5
+      gemfile: gemfiles/Gemfile-rails.5.2.x
+    - rvm: 2.2.10
+      gemfile: gemfiles/Gemfile-rails.5.2.x
+
     - rvm: ruby-head
-      gemfile: gemfiles/Gemfile-rails.4.2.x
+      gemfile: gemfiles/Gemfile-rails.5.2.x
+
+    - rvm: 2.6.0
+      gemfile: gemfiles/Gemfile-rails.edge
+
   allow_failures:
     - rvm: ruby-head
+    - gemfile: gemfiles/Gemfile-rails.edge