pass --verbose flag down to curl / wget

[gugod]

While this may make the output very noisy as curl/wget prints a lot of
connection information under verbose mode, they do provide some
helpful information especially when connection problems may occur.

Thanks to @Pascal666 for suggesting this in #653

[coveralls]

Coverage increased (+0.2%) to 77.67% when pulling 3395145 on verbose-http-output into e790002 on develop.

[gugod]

links to external discussion threads:

• https://twitter.com/gugod/status/1503906577849647104
• https://www.reddit.com/r/perl/comments/tf629q/request_for_comments_to_perlbrew_users/

[cromedome]

Yes, please.