nanomsg: add hash for license file

Signed-off-by: Rahul Bedarkar <rahulbedarkar89@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/nanomsg/nanomsg.hash

@@ -1,2 +1,5 @@
 # Locally computed
 sha256 24afdeb71b2e362e8a003a7ecc906e1b84fd9f56ce15ec567481d1bb33132cc7  nanomsg-1.0.0.tar.gz
+
+# Hash for license file:
+sha256 4e51f6a04312ea7c5f4f0e92d91b6415c1eeb09bdaf86a6fd11d93499457c07a  COPYING