rubygems/rubygems.org — pull request #571 by dblandin (2013-06-14 22:07:14+00:00)
Title: Prefer simple quotes of double quote for Gemfile version format

I always make this switch after copying and pasting from a RubyGem page.

gem "hola", "~> 0.0.0"

to

gem 'hola', '~> 0.0.0'

Without any interpolation or escaping, using double quotes seems unnecessary.