Update Makefile (#65)

diff --git a/Makefile b/Makefile
index 697fda5..2543766 100644
--- a/Makefile
+++ b/Makefile
@@ -44,6 +44,7 @@
 		./t \
 		./Makefile \
 		./NOTICE \
+		./LICENSE \
 		./*.md 
 
 	gpg --batch --yes --armor --detach-sig $(RELEASE_SRC).tgz