Use generated Gemfile to store rdoc specific requirement for Ruby 2.2

Author: benoittgt

Gemfile

@@ -24,11 +24,6 @@ end
 
 gem 'sqlite3', '~> 1.3.6'
 
-# Version 6.0.4 of rdoc requires Ruby 2.2
-if RUBY_VERSION < '2.2'
-  gem 'rdoc', '< 6.0.4'
-end
-
 if RUBY_VERSION >= '2.4.0'
   gem 'json', '>= 2.0.2'
 end

example_app_generator/generate_app.rb

@@ -47,6 +47,11 @@
     |  gem 'mime-types', '< 3'
     |end
     |
+    |# Version 6.0.4 of rdoc requires Ruby 2.2
+    |if RUBY_VERSION < '2.2'
+    |  gem 'rdoc', '< 6.0.4'
+    |end
+    |
     |gem 'rspec-rails',
     |    :path => '#{rspec_rails_repo_path}',
     |    :groups => [:development, :test]