move release documentation to sipwise-base

this basically reverts the last commit

README

@@ -14,28 +14,6 @@ See L<http://www.cpan.org/modules/INSTALL.html>.
 
 See distribution meta file.
 
-=head1 TAGGING A NEW RELEASE
-
-=over
-
-=item Create a new entry in the Changes file
-
-=item Update debian/changelog using the command C<dch -i>
-
-=item *
-
-Update the perl files using
-C<perl-reversion -dryrun -set $VERSION>. Remove C<-dryrun> to actually
-run this command.
-
-=item git commit your work with $VERSION as commit message
-
-=item run C<git tag -u $KEY -s $VERSION>
-
-=item run C<git push> and C<git push --tags>
-
-=back
-
 =head1 LICENCE
 
 This software is Copyright © 2013 by Sipwise GmbH, Austria.