libfreefare: add hash for license file

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libfreefare/libfreefare.hash

@@ -1,2 +1,5 @@
 # From https://github.com/nfc-tools/libfreefare/releases/download/libfreefare-0.4.0/libfreefare-0.4.0.tar.bz2
 sha256 bfa31d14a99a1247f5ed49195d6373de512e3eb75bf1627658b40cf7f876bc64  libfreefare-0.4.0.tar.bz2
+
+# Hash for license file:
+sha256 be6209dfd763a0ba77fbe990cfd2512804441d8b5f0cad927baa3341b50fcade  COPYING