[ruby/reline] Implement show-all-if-ambiguous feature (https://github.com/ruby/reline/pull/683)
show-all-if-ambiguous
https://github.com/ruby/reline/commit/0fe4fdc794
[ruby/reline] Implement
show-all-if-ambiguousfeature(https://github.com/ruby/reline/pull/683)
https://github.com/ruby/reline/commit/0fe4fdc794