.travis.yml in fernet-2.0.rc1 vs .travis.yml in fernet-2.0.rc2

@@ -2,8 +2,7 @@
 
 rvm:
   - "1.9.3"
   - "1.9.2"
   - "2.0.0"
-  - "ruby-head"
 
 script: bundle exec rspec -b spec