bcache: mark Coly Li as bcache maintainer

Since Michael had to step back, Coly has agreed to be the new
maintainer. Mark him as such.

Signed-off-by: Jens Axboe <axboe@kernel.dk>

MAINTAINERS

@@ -2614,6 +2614,7 @@ S:	Maintained
 F:	drivers/net/hamradio/baycom*
 
 BCACHE (BLOCK LAYER CACHE)
+M:	Coly Li <colyli@suse.de>
 M:	Kent Overstreet <kent.overstreet@gmail.com>
 L:	linux-bcache@vger.kernel.org
 W:	http://bcache.evilpiepirate.org