.travis.yml in github_webhook-1.0.4 vs .travis.yml in github_webhook-1.0.5

@@ -1,7 +1,8 @@
 language: ruby
 rvm:
-  - 2.3.1
+  - 2.4.1
+  - 2.3.4
   - 2.2.5
 addons:
   code_climate:
     repo_token: 50425d682162d68af0b65bd9e5160da8337d2159fc3ebc00d2a5b14386548ac5