.travis.yml in lite_config-0.0.3 vs .travis.yml in lite_config-0.0.4

@@ -1,6 +1,7 @@
 language: ruby
+before_install: gem update bundler
 cache: bundler
 rvm:
-  - 1.9.3
-  - 2.0.0
   - 2.1.0
+  - 2.2.0
+  - 2.3.0