Test against Ruby 2.2.6 on CircleCI (ctran#416)

koic · johncarney · commit 80c6ab9c662f · 2017-06-19T11:50:10.000+10:00
diff --git a/circle.yml b/circle.yml
@@ -1,3 +1,3 @@
 machine:
   ruby:
-    version: 2.2.4
+    version: 2.2.6
