`-l` option has used `chomp!` since Ruby 2.5.  [Bug #12926]

https://github.com/rubygems/rubygems/commit/58d9a3de5b

https://github.com/rubygems/rubygems/commit/515effe8de

https://github.com/rubygems/rubygems/commit/b5a9cec1be

* Recently built man pages on my branch had odd whitespace/characters
resulting from using the macOS installed version of groff (v1.19) and
homebrew's (v1.24)
* Followed the advice in this pull request:
https://github.com/rubygems/rubygems/pull/3394
* Encountered invalid byte sequence sed error, found this link:
https://lists.gnu.org/archive/html/groff/2014-10/msg00072.html

https://github.com/rubygems/rubygems/commit/f379d1d70e

* bundle gem previously ignored gem.test when passed empty -t flag,
defaulting to RSpec
* bundle gem will now ask user for test framework when passed empty -t
flag and gem.test is set to false, but will not overwrite gem.test
* thor option parsing for String types falls back to human name for nil,
so setting lazy_default to nil won't work
* https://github.com/erikhuda/thor/blob/c5161501e0cfac7a8c5b838a9c6084c275f03c0d/lib/thor/parser/options.rb#L224

Default to Bundler.settings["gem.test"] for empty --test

Add shared examples for test framework to newgem spec

Add examples for empty --test flag to newgem spec

Simplify conditional for prompting test framework

Follow naming conventions for bundler settings

Add more descriptive test framework help text for bundle gem

Update man pages for bundler

https://github.com/rubygems/rubygems/commit/ab0785a09f