.travis.yml in transaction_timestamps-0.1.0 vs .travis.yml in transaction_timestamps-0.2.0

@@ -1,4 +1,11 @@
 language: ruby
 rvm:
-  - 2.2.1
+  - 2.2.3
 before_install: gem install bundler -v 1.11.2
+gemfile:
+  - gemfiles/rails_4.2_sqlite.gemfile
+  - gemfiles/rails_4.2_postgres.gemfile
+  - gemfiles/rails_4.2_mysql.gemfile
+  - gemfiles/rails_5_sqlite.gemfile
+  - gemfiles/rails_5_postgres.gemfile
+  - gemfiles/rails_5_mysql.gemfile