.travis.yml in rubyntlm-0.6.0 vs .travis.yml in rubyntlm-0.6.1

@@ -1,10 +1,12 @@
 language: ruby
 rvm:
-  - 1.9.3
-  - 1.9.2
-  - 2.0.0
-  - rbx-19mode
-  - rbx-18mode
-  - jruby-19mode
+  - 2.1.9
+  - 2.2.0
+  - 2.3.1
 before_install:
   - gem update bundler
+
+# This prevents testing branches that are created just for PRs
+branches:
+  only:
+  - master