.travis.yml in briar-2.0.4 vs .travis.yml in briar-2.0.5

@@ -7,10 +7,10 @@
 script:
   - bundle update
   - bundle exec rake spec
 
 rvm:
-  - 2.1.2
+  - 2.3.1
 
 notifications:
   email:
     recipients:
       - [e-mail]