Revert "Set Ruby version in Gemfile and .ruby-version by default"

This reverts commit fd7f978a50.

railties/CHANGELOG.md

@@ -2,12 +2,6 @@
 
     *Yuji Yaginuma*
 
-*   Add `ruby x.x.x` version to `Gemfile` and create `.ruby-version`
-    root file containing the current Ruby version when new Rails applications are
-    created.
-
-    *Alberto Almagro*
-
 *   Support `-` as a platform-agnostic way to run a script from stdin with
     `rails runner`
 

railties/lib/rails/generators/rails/app/app_generator.rb

@@ -49,10 +49,6 @@ module Rails
       copy_file "README.md", "README.md"
     end
 
-    def ruby_version
-      template "ruby-version", ".ruby-version"
-    end
-
     def gemfile
       template "Gemfile"
     end
@@ -257,7 +253,6 @@ module Rails
       def create_root_files
         build(:readme)
         build(:rakefile)
-        build(:ruby_version)
         build(:configru)
         build(:gitignore)   unless options[:skip_git]
         build(:gemfile)     unless options[:skip_gemfile]

railties/lib/rails/generators/rails/app/templates/ruby-version

@@ -1 +0,0 @@
-<%= RUBY_VERSION -%>

railties/test/generators/app_generator_test.rb

@@ -4,7 +4,6 @@ require "generators/shared_generator_tests"
 
 DEFAULT_APP_FILES = %w(
   .gitignore
-  .ruby-version
   README.md
   Gemfile
   Rakefile
@@ -809,17 +808,6 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
   end
 
-  def test_inclusion_of_ruby_version
-    run_generator
-
-    assert_file "Gemfile" do |content|
-      assert_match(/ruby '#{RUBY_VERSION}'/, content)
-    end
-    assert_file ".ruby-version" do |content|
-      assert_match(/#{RUBY_VERSION}/, content)
-    end
-  end
-
   def test_version_control_initializes_git_repo
     run_generator [destination_root]
     assert_directory ".git"