Fix homepage URL in twigg gemspec
Fix homepage URL in twigg gemspec

I renamed the projects on Gerrit and GitHub yesterday; update the
gemspec to match.

Change-Id: Ib51950f687b20989392767f04af7649d7693882d
Reviewed-on: https://gerrit.causes.com/25819
Reviewed-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>
Tested-by: Greg Hurrell <79e2475f81a6317276bf7cbb3958b20d289b78df@causes.com>

causes/twigg,causes/twigg