luajson: add hash file

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

package/luajson/luajson.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256	4898e5575713b37a1eb9badbd3968e15ec1856115daaed9819acf39113616619  luajson-1.3.3-1.src.rock