change to 2.2 alias

travis alias resolves correctly again

Author: adavidw

.travis.yml

@@ -4,15 +4,14 @@ sudo:
     false
 
 rvm:
-  - 2.2.7    # can't use the 2.2 alias because as of July 2017 travis resolves that to 2.2.0
+  - 2.2
   - 2.3
   - 2.4
 
 before_script:
   - git submodule update --remote --recursive
 
-script: 
+script:
   - bundle exec rake spec:ci
   - bundle exec rake spec:api
   - bundle exec rake spec:testrunner
-