binding/python/README is hopelessly outdated

[Konrad Hinsen]

Hi everyone,

while looking for the latest source for checking if my recent bug report 
still applies, I noticed that the README for the Python bindings is 
hopelessly outdated. It refers to a bitbucket repository that hasn't 
been updated since 2010. Moreover, it recommends installing from PyPI, 
where I cannot find the notmuch Python bindings any more.

Cheers,
   Konrad.