Fix ruby versions on travis

Author: arthurnn

.travis.yml

@@ -3,8 +3,8 @@ language: ruby
 rvm:
  - 2.0.0
  - 2.1
- - 2.2
- - 2.3
+ - 2.2.5
+ - 2.3.1
  - rbx-2
 
 gemfile:
@@ -21,9 +21,9 @@ matrix:
     - rvm: rbx-2
   include:
     - gemfile: gemfiles/Gemfile-rails-5-0
-      rvm: 2.3
+      rvm: 2.3.1
     - gemfile: Gemfile
-      rvm: 2.3
+      rvm: 2.3.1
 
 notifications:
   email: false