rings: add LICENSE_FILES

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/rings/rings.mk

@@ -8,5 +8,6 @@ RINGS_VERSION_MAJOR = 1.3.0
 RINGS_VERSION = $(RINGS_VERSION_MAJOR)-1
 RINGS_SUBDIR = rings-v_$(subst .,_,$(RINGS_VERSION_MAJOR))
 RINGS_LICENSE = MIT
+RINGS_LICENSE_FILES = $(RINGS_SUBDIR)/doc/us/license.html
 
 $(eval $(luarocks-package))