Bump to rails 6 and ruby 2.7

Author: leequarella

.github/workflows/ruby.yml

@@ -9,10 +9,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Set up Ruby 2.5.7
+    - name: Set up Ruby 2.7
       uses: actions/setup-ruby@v1
       with:
-        ruby-version: 2.5.7
+        ruby-version: 2.7.x
+
     - name: Build and test
       run: |
         gem install bundler:1.16.1

.ruby-version

@@ -1 +1 @@
-2.5.7
+2.7.1

Gemfile

@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'rails', '~> 4.0'
+gem 'rails', '~> 6.0'
 
 group :development, :test do
   gem "rspec-rails", "~> 3"

spec/dummy/config/environments/test.rb

@@ -13,7 +13,7 @@
   config.eager_load = false
 
   # Configure static file server for tests with Cache-Control for performance.
-  if Rails.version.starts_with?("5")
+  if Rails.version.start_with?("5")
     config.public_file_server.enabled = true
     config.public_file_server.headers = { 'Cache-Control' => 'public, max-age=3600' }
   else