.travis.yml in epub-parser-0.2.5 vs .travis.yml in epub-parser-0.2.6

@@ -1,4 +1,4 @@
 rvm:
-  - "2.1.8"
-  - "2.2.4"
-  - "2.3.0"
+  - "2.1.10"
+  - "2.2.5"
+  - "2.3.1"