Clean up Gemfile.rails60 and test on Ruby 2.7

Author: mmoll

.travis.yml

@@ -9,7 +9,8 @@ rvm:
   - 2.3.8
   - 2.4.5
   - 2.5.3
-  - 2.6.0
+  - 2.6.5
+  - 2.7.0
 gemfile:
   - Gemfile.rails42
   - Gemfile.rails51 # Min ruby 2.2.2
@@ -18,8 +19,12 @@ matrix:
   exclude:
     - rvm: 2.5.3
       gemfile: Gemfile.rails42
-    - rvm: 2.6.0
+    - rvm: 2.6.5
       gemfile: Gemfile.rails42
+    - rvm: 2.7.0
+      gemfile: Gemfile.rails42
+    - rvm: 2.7.0
+      gemfile: Gemfile.rails51
     - rvm: 2.2.10
       gemfile: Gemfile.rails60
     - rvm: 2.3.8

Gemfile.rails60

@@ -2,13 +2,9 @@ source "https://rubygems.org"
 
 gemspec
 
-gem 'rails', '~> 6.0.0.rc1'
+gem 'rails', '~> 6.0.2'
 gem 'mime-types', '~> 2.99.3'
 gem 'rails-controller-testing'
-gem 'rspec-rails', git: 'https://github.com/rspec/rspec-rails', branch: '4-0-dev'
-gem 'rspec-core', git: 'https://github.com/rspec/rspec-core'
-gem 'rspec-mocks', git: 'https://github.com/rspec/rspec-mocks'
-gem 'rspec-support', git: 'https://github.com/rspec/rspec-support'
-gem 'rspec-expectations', git: 'https://github.com/rspec/rspec-expectations'
+gem 'rspec-rails', '4.0.0.beta3'
 
 gem 'test_engine', path: 'spec/dummy/components/test_engine', group: :test