Simplify directory name in generated ZIP files

Author: kpfleming

Makefile

@@ -2,7 +2,7 @@ NAME := arduino-timer-cpp17
 VERSION := $(shell git describe --tags --always --dirty)
 
 $(NAME)-$(VERSION).zip:
-	git archive HEAD --prefix=$(@:.zip=)/ --format=zip -o $@
+	git archive HEAD --prefix=$(NAME)/ --format=zip -o $@
 
 tag:
 	git tag $(VERSION)