Merge pull request #136 from my-codeworks/update-travis-ruby-versions

Updates Ruby versions that Travis runs

Author: Hannes Elvemyr

.travis.yml

@@ -1,8 +1,21 @@
 rvm:
   - "2.2.5"
+  - "2.2.6"
+  - "2.2.7"
+  - "2.2.8"
+  - "2.2.9"
   - "2.3.0"
   - "2.3.1"
-  # - "2.4.0" TODO: Ruby 2.4 not supported yet. See issue #93.
+  - "2.3.2"
+  - "2.3.3"
+  - "2.3.4"
+  - "2.3.5"
+  - "2.3.6"
+  - "2.4.0"
+  - "2.4.1"
+  - "2.4.2"
+  - "2.4.3"
+  - "2.5.0"
 addons:
   code_climate:
     repo_token: 397c19af63ca3467cff6fd640b0460b691f687118332b5989f530d28f82adcb8