[ruby/optparse] Update required ruby version
Now needs DidYouMean#formatter which is provided since did_you_mean 1.2, which requires ruby 2.5.
DidYouMean#formatter
https://github.com/ruby/optparse/commit/d44bb5c715
Added by nobu (Nobuyoshi Nakada) over 5 years ago
[ruby/optparse] Update required ruby version
Now needs
DidYouMean#formatterwhich is provided sincedid_you_mean 1.2, which requires ruby 2.5.
https://github.com/ruby/optparse/commit/d44bb5c715