Merge pull request #73 from twingly/bump-rubies

Test with latest Ruby versions

Author: dentarg

.travis.yml

@@ -5,11 +5,12 @@ before_install:
 cache: bundler
 rvm:
   - 2.1.10
-  - 2.2.8
-  - 2.3.5
-  - 2.4.2
+  - 2.2.9
+  - 2.3.6
+  - 2.4.3
+  - 2.5.0
   - jruby-9.0.5.0
-  - jruby-9.1.14.0
+  - jruby-9.1.15.0
 notifications:
   email: false
   hipchat: