.travis.yml in museum-0.5.0 vs .travis.yml in museum-0.5.1

@@ -1,4 +1,5 @@
 language: ruby
 rvm:
-  - 2.1.2
-  - 2.1.1
+  - 2.2.2
+  - 2.2.3
+  - 2.3.1
\ No newline at end of file