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required_ruby_version= 

        # Gem::Specification.required_ruby_version=

(from ruby core)
### Implementation from Specification
---
    required_ruby_version=(req)

---

The version of Ruby required by this gem.  The ruby version can be
specified to the patch-level:

    $ ruby -v -e 'p Gem.ruby_version'
    ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.4.0]
    #<Gem::Version "2.0.0.247">

Prereleases can also be specified.

Usage:

    # This gem will work with 1.8.6 or greater...
    spec.required_ruby_version = '>= 1.8.6'

    # Only with final releases of major version 2 where minor version is at least 3
    spec.required_ruby_version = '~> 2.3'

    # Only prereleases or final releases after 2.6.0.preview2
    spec.required_ruby_version = '> 2.6.0.preview2'

    # This gem will work with 2.3.0 or greater, including major version 3, but lesser than 4.0.0
    spec.required_ruby_version = '>= 2.3', '< 4'

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