.travis.yml in formulaic-0.1.3 vs .travis.yml in formulaic-0.1.4

@@ -1,7 +1,6 @@
 rvm:
-  - "2.0.0"
-  - "2.1.0"
-  - "2.1.1"
-  - "2.1.2"
+  - "2.0"
+  - "2.1"
+  - "2.2"
 notifications:
   email: false