Use a version of 2.2 on travis that is not 2.2.0.

myronmarston · myronmarston · commit d0318da4f484 · 2016-06-14T22:24:16.000-07:00
2.2.0 produces a confusing warning that later versions
do not produce.
diff --git a/travis/.travis.yml b/travis/.travis.yml
@@ -17,7 +17,7 @@ rvm:
   - 1.9.3
   - 2.0.0
   - 2.1
-  - 2.2
+  - 2.2.5
   - 2.3.1
   - ruby-head
   - ree

-Original file line number
+Diff line change
   - 1.9.3
   - 2.0.0
   - 2.1
 -  - 2.2
 +  - 2.2.5
   - 2.3.1
   - ruby-head
   - ree