Add mailing list address to README
Add mailing list address to README

Its been pointed out that the development mailing list address is not
listed in the README file, and that a google search still points to our
old sourceforge list.

Update the README with our current development mailing list.

Signed-off-by: Tyrel Datwyler <f4a317f2a73d762775eb462a22d913f1ae21c433@linux.vnet.ibm.com>

shenki/powerpc-utils,shenki/powerpc-utils,shenki/powerpc-utils