.travis.yml in jp_prefecture-0.8.1 vs .travis.yml in jp_prefecture-0.9.0

@@ -1,13 +1,32 @@
 language: ruby
 sudo: false
+cache: bundler
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.8
   - 2.2.4
-  - 2.3.0
+  - 2.3.3
+  - 2.4.0
   - ruby-head
+gemfile:
+  - gemfiles/rails32.gemfile
+  - gemfiles/rails40.gemfile
+  - gemfiles/rails41.gemfile
+  - gemfiles/rails42.gemfile
+  - gemfiles/rails50.gemfile
 matrix:
   allow_failures:
+    - rvm: 1.9.3
     - rvm: ruby-head
   fast_finish: true
+  exclude:
+    - rvm: 1.9.3
+      gemfile: gemfiles/rails50.gemfile
+    - rvm: 2.0.0
+      gemfile: gemfiles/rails50.gemfile
+    - rvm: 2.1.8
+      gemfile: gemfiles/rails50.gemfile
+notifications:
+  email:
+    - false