.travis.yml in drg-0.16.0 vs .travis.yml in drg-1.0.0

@@ -1,4 +1,7 @@
 language: ruby
 rvm:
+  - 1.9.3
   - 2.2.1
-before_install: gem install bundler -v 1.10.4
+  - 2.2.2
+  - 2.2.3
+before_install: gem install bundler -v 1.10.5