method
    
    check_ruby_version
 
  check_ruby_version()
  public
  Check for valid Ruby version This is done in an external file, so we can use it from the `rails` program as well without duplication.
 
  check_ruby_version()
  public
  Check for valid Ruby version This is done in an external file, so we can use it from the `rails` program as well without duplication.