development/git-cola: Add source alternative from github.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

development/git-cola/git-cola.SlackBuild

@@ -42,7 +42,7 @@ rm -rf $PKG
 mkdir -p $TMP $PKG $OUTPUT
 cd $TMP
 rm -rf $PRGNAM-$VERSION
-tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
+tar xvf $CWD/$PRGNAM-$VERSION.tar.gz || tar xvf $CWD/v$VERSION.tar.gz
 cd $PRGNAM-$VERSION
 chown -R root:root .
 find -L . \