Update README with otr community website and bugtracker
As it's listed in README at the moment is that bug reports are best send to an e-mail address. Currently, we have a great bugtracker for this with an cypherpunks account that anyone could login to.
We should modify the README so..:
- List that bug reports are best placed onto the bugtracker.
- Remove that bugreports are best send to the otr-dev mailinglist.
(from redmine: created on 2014-10-11)