Style for task dependency syntax

[ydakuka]

1. Move the Rails/RakeEnvironment cop to rubocop-rake as the Rake/Rails/RakeEnvironment cop.

2. The cop accepts two valid styles. I think one should be the preferred choice.

a)

desc 'delete non-unique banners'
task 'delete_non_unique_banners' => :environment do
  # ...
end

or

b)

desc 'delete non-unique banners'
task delete_non_unique_banners: :environment do
  # ...
end

[koic]

This would be a style about task-dependent notation, not a cop for specific tasks.
NOTE: It should be checked for conflicts with Style/Hash cop.