「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"」
「documentation.js has pluggable output formats: you can get raw documentation as JSON, beautiful, customizable HTML, or Markdown that fits perfectly into an API.md or README.md file in a Github repository」