Update the irclib dependency to version 0.4.8.
Update the irclib dependency to version 0.4.8.

Add an explicit url in dependency_links for irclib's SourceForge
download page. The url currently in PyPI is stale, so the download
fails.

It looks like the upstream package is now called "irc", so
investigate porting cobe to that in the future.

Fixes #3: "Depends on outdated irclib?"

LeMagnesium/cobe,DarkMio/cobe,DarkMio/cobe,wodim/cobe-ng,meska/cobe,pteichman/cobe,pteichman/cobe,LeMagnesium/cobe,wodim/cobe-ng,tiagochiavericosta/cobe,meska/cobe,tiagochiavericosta/cobe