subclass_must_implement 0.0.1

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Development :

bundler 1.17.3 ~> 1.15

colorize 1.1.0 >= 0

rake 13.2.1 >= 0

rspec 3.13.0 >= 0

simplecov 0.22.0 >= 0

simplecov-rcov-text 0.0.3 >= 0