Add `.github/scripts` to release source tarball (#140)

diff --git a/Makefile b/Makefile
index e806eb9..6971629 100644
--- a/Makefile
+++ b/Makefile
@@ -106,7 +106,6 @@
 	--exclude .git \
 	--exclude .idea \
 	--exclude .DS_Store \
-	--exclude .github \
 	--exclude dist \
 	--exclude $(RELEASE_SRC).tgz \
 	.