Test against Ruby 2.2.6 on CircleCI (#416)

koic · ctran · commit 417d10bb861d · 2016-12-12T19:35:25.000-08:00
diff --git a/circle.yml b/circle.yml
@@ -1,3 +1,3 @@
 machine:
   ruby:
-    version: 2.2.4
+    version: 2.2.6
