.travis.yml in polish_invoicer-0.0.5 vs .travis.yml in polish_invoicer-0.0.6

@@ -1,4 +1,5 @@
 language: ruby
 rvm:
-  - 2.0.0
-  - 1.9.3
+  - 2.2.7
+  - 2.3.4
+  - 2.4.1