gnucash master: Update README to refer to Git rather than SVN

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/7c42908b (commit)
	from  https://github.com/Gnucash/gnucash/commit/9ea1dd0f (commit)



commit 7c42908b133a0935202e33cc1f0ece7eb5ac7956
Author: Benjamin Melançon <ben at agaric.com>
Date:   Wed Apr 29 16:50:57 2015 -0400

    Update README to refer to Git rather than SVN



Summary of changes:
 README | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)