.travis.yml in dynamoid-1.3.0 vs .travis.yml in dynamoid-1.3.1

- old
+ new
@@ -1,12 +1,28 @@
 language: ruby
 rvm:
   - ruby-2.0.0-p648
   - ruby-2.1.10
-  - ruby-2.2.5
-  - ruby-2.3.1
-  - jruby-9.1.4.0
-before_install: gem install bundler -v 1.12.5
+  - ruby-2.2.6
+  - ruby-2.3.3
+  - ruby-2.4.1
+  - jruby-9.1.8.0
+gemfile:
+  - gemfiles/rails_4_0.gemfile
+  - gemfiles/rails_4_1.gemfile
+  - gemfiles/rails_4_2.gemfile
+  - gemfiles/rails_5_0.gemfile
+matrix:
+  exclude:
+    - rvm: ruby-2.0.0-p648
+      gemfile: gemfiles/rails_5_0.gemfile
+    - rvm: ruby-2.1.10
+      gemfile: gemfiles/rails_5_0.gemfile
+    - rvm: ruby-2.4.1
+      gemfile: gemfiles/rails_4_0.gemfile
+    - rvm: ruby-2.4.1
+      gemfile: gemfiles/rails_4_1.gemfile
+before_install: gem install bundler -v 1.14.6
 install:
   - wget http://dynamodb-local.s3-website-us-west-2.amazonaws.com/dynamodb_local_latest.zip --quiet -O spec/dynamodb_temp.zip
   - unzip -qq spec/dynamodb_temp.zip -d spec/DynamoDBLocal-latest
   - rm spec/dynamodb_temp.zip
 script: