.travis.yml in fresh_connection-2.0.4 vs .travis.yml in fresh_connection-2.1.0

@@ -12,12 +12,12 @@
   - psql -c 'create database fresh_connection_test_slave2;' -U postgres
 cache: bundler
 rvm:
   - 2.0.0
   - 2.1.8
-  - 2.2.4
-  - 2.3.0
+  - 2.2.5
+  - 2.3.1
   - ruby-head
 gemfile:
   - gemfiles/rails40.gemfile
   - gemfiles/rails41.gemfile
   - gemfiles/rails42.gemfile
@@ -32,8 +32,7 @@
       gemfile: gemfiles/rails50.gemfile
     - rvm: 2.1.8
       gemfile: gemfiles/rails50.gemfile
   allow_failures:
     - rvm: ruby-head
-    - gemfile: gemfiles/rails50.gemfile
   fast_finish: true
 bundler_args: --jobs 3 --retry 3