Update Ruby versions for CI (#55)

parndt · web-flow · commit 0d636dc92f8c · 2019-09-23T11:49:17.000+12:00
More modern versions are out, and required by Refinery CMS
diff --git a/.travis.yml b/.travis.yml
@@ -17,7 +17,7 @@ notifications:
   webhooks:
     - https://webhooks.gitter.im/e/b5d48907cdc89864b874
 rvm:
-  - 2.4.1
-  - 2.3.3
-  - 2.2.6
+  - 2.6.4
+  - 2.5.6
+  - 2.4.7
 sudo: false
