Update chat/weechat to 0.3.4

Update chat/weechat to 0.3.4
Fix for SA43543 and update kindly provided by gls@

This is a major release, with lot of bugs fixed and major new features.

Among the new features:
- 256 colors support, with unlimited number of nick colors
- irc proxy (relay plugin)
- redirection of IRC commands
- command /notify
- rmodifier plugin
- regular expressions for highlights
- color support for timestamp in chat buffer
- irc option to force color for some nicks
- share input line between buffers.