QMP/README: Update QMP homepage address

Signed-off-by: NLuiz Capitulino <lcapitulino@redhat.com>
(cherry picked from commit a18b2ce2)

QMP/README

@@ -88,4 +88,4 @@ doing any code change. This is so because:
 Homepage
 --------
 
-http://www.linux-kvm.org/page/MonitorProtocol
+http://wiki.qemu.org/QMP