.travis.yml in danger-php_codesniffer-0.1.2 vs .travis.yml in danger-php_codesniffer-0.1.3

@@ -2,11 +2,12 @@
 cache:
   directories:
     - bundle
 
 rvm:
-  - 2.0
-  - 2.1.3
-  - 2.3.1
+  - 2.3.8
+  - 2.4.5
+  - 2.5.3
+  - 2.6.0
 
 script:
     - bundle exec rake spec
\ No newline at end of file