.travis.yml in ensure_it-0.1.0 vs .travis.yml in ensure_it-0.1.1

- old
+ new

@@ -1,7 +1,10 @@
 language: ruby
 rvm:
   - 2.0.0
   - 2.1.1
+  - ruby-head
 env:
-  - USE_REFINES=true
-  - USE_REFINES=false
+  - USE_REFINES=true USE_COVERALLS=true
+  - USE_REFINES=true USE_COVERALLS=false
+  - USE_REFINES=false USE_COVERALLS=true
+  - USE_REFINES=false USE_COVERALLS=false