clarify 2.0.0

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Development :

bundler 1.17.3 ~> 1.5

cucumber 1.3.20 ~> 1.3.0

rake 10.5.0 ~> 10.0

rspec 3.13.0 ~> 3.0

rspec-expectations 3.2.1 ~> 3.2.0

rubocop 0.29.1 ~> 0.29.0

simplecov 0.9.2 ~> 0.9.0