pidgin/pidgin

b6ba34e4906d
Update the about box to point people to discourse instead of the mailing list.

I also did a drive-by in the README that was telling people to create issues
at developer.pidgin.im.

Testing Done:
Ran and verified the text was correct in the about box.

Reviewed at https://reviews.imfreedom.org/r/2154/
For information on writing a plugin for Purple, Pidgin or Finch, go
http://developer.pidgin.im and click on API. From there, see the
HOWTOs in the "Related Pages" section.
You can also generate this documentation locally by installing
doxygen and graphviz dot, then running "make docs" in the
source tree. The documentation will be in the docs/html directory.