[ruby]Gem::Specification.add_dependency や add_development_dependency にて指定するバージョンで ~> (チルダ、ニョロ) を使う場合。「~> 2.0.3 is identical to >= 2.0.3 and < 2.1. ~> 2.1 is identical to >= 2.1 and < 3.0. ~> 2.2.beta will match prerelease versions like 2.2.beta.12.」
「spec.add_dependency "activesupport", ">= 4.2.0"」「However, relying on a version simply greater than the latest-at-the-time is a sure-fire way to run into problems later on down the line. Try to always use ~> for specifying dependencies:」spec.add_dependency "activesupport", "~> 4.2.0"」
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