Specify Rails 5.2.0 proper

.travis.yml

@@ -14,7 +14,7 @@ env:
     - RAILS='~> 4.2.0'
     - RAILS='~> 5.0.0'
     - RAILS='~> 5.1.0'
-    - RAILS='~> 5.2.0.rc2'
+    - RAILS='~> 5.2.0'
 
 matrix:
   allow_failures:
@@ -24,5 +24,5 @@ matrix:
       rvm: jruby-9.1.6.0
     - env: RAILS='~> 5.1.0'
       rvm: jruby-9.1.6.0
-    - env: RAILS='~> 5.2.0.rc2'
+    - env: RAILS='~> 5.2.0'
       rvm: jruby-9.1.6.0

Gemfile

@@ -12,7 +12,7 @@ platforms :rbx do
   gem 'rubinius-developer_tools'
 end
 
-rails = ENV['RAILS'] || '~> 5.1.0'
+rails = ENV['RAILS'] || '~> 5.2.0'
 
 gem 'rails', rails