IRC and ICB client

Current version

ircii requires the following formula to be installed:
openssl 1.0.2n SSL/TLS cryptography library

Recent formula history

ilovezfs ircii 20170704
ilovezfs ircii: use https for stable url
Alex Dunn ircii: add test
Alex Dunn ircii: add mirrors
Zhiming Wang ircii: downgrade URL to HTTP (#6404)

Formula code at GitHub