.travis.yml in signore-0.5.0 vs .travis.yml in signore-0.6.0

@@ -3,10 +3,8 @@
 language: ruby
 matrix:
   allow_failures:
     - rvm: ruby-head
 rvm:
-  - ruby-2.1
-  - ruby-2.2
   - ruby-2.3.0
   - ruby-head
 sudo: false