`github` as source block in Gemfile

source blocks in a Ruby Gemfile help group gems together that come from the same source. In addition, the Gemfile supports a github block for multiple gems that are coming from the same github repository. In my specific case, there are two gemspecs in the Brian Dunn's flatware repo.

github 'briandunn/flatware', branch: master do
  gem 'flatware-rspec'
  gem 'flatware-cucumber'
end

With this example, only one change is needed to change the branch that both of those gems will come from.

H/T Brian Dunn