.travis.yml in kaminari-1.0.1 vs .travis.yml in kaminari-1.1.0

@@ -1,48 +1,56 @@
 language: ruby
-dist: trusty
 
 rvm:
-  - 2.4.0
-  - 2.3.3
-  - 2.2.6
-  - 2.1.10
-  - 2.0.0
+  - 2.4.2
+  - 2.3.5
   - ruby-head
-  - jruby-9.1.7.0
-  - rbx-3
+  - jruby-9.1.13.0
+  # - rbx-3
 
 gemfile:
+  - gemfiles/active_record_51.gemfile
   - gemfiles/active_record_50.gemfile
   - gemfiles/active_record_42.gemfile
   - gemfiles/active_record_41.gemfile
   - gemfiles/active_record_edge.gemfile
 
+env:
+  - DB=sqlite3
+  - DB=postgresql
+  - DB=mysql
+
 sudo: false
 
-before_install: gem update bundler --no-document
+before_install:
+  - gem update --system
+  - gem update bundler --no-document
 script: 'bundle exec rake test'
 
 cache: bundler
 
 matrix:
   exclude:
-    - rvm: 2.0.0
-      gemfile: gemfiles/active_record_50.gemfile
-    - rvm: 2.1.10
-      gemfile: gemfiles/active_record_50.gemfile
-    - rvm: 2.0.0
-      gemfile: gemfiles/active_record_edge.gemfile
-    - rvm: 2.1.10
-      gemfile: gemfiles/active_record_edge.gemfile
-    - rvm: 2.4.0
+    - rvm: 2.4.2
+      gemfile: gemfiles/active_record_42.gemfile
+    - rvm: 2.4.2
       gemfile: gemfiles/active_record_41.gemfile
-    - rvm: 2.4.0
+    - rvm: ruby-head
       gemfile: gemfiles/active_record_42.gemfile
     - rvm: ruby-head
       gemfile: gemfiles/active_record_41.gemfile
+  include:
+    - rvm: 2.2.8
+      gemfile: gemfiles/active_record_51.gemfile
+      env: DB=sqlite3
+    - rvm: 2.1.10
+      gemfile: gemfiles/active_record_42.gemfile
+      env: DB=sqlite3
+    - rvm: 2.0.0
+      gemfile: gemfiles/active_record_42.gemfile
+      env: DB=sqlite3
   allow_failures:
     - rvm: ruby-head
-    - rvm: jruby-9.1.7.0
-    - rvm: rbx-3
+    - rvm: jruby-9.1.13.0
+    # - rvm: rbx-3
     - gemfile: gemfiles/active_record_edge.gemfile
   fast_finish: true