fix: Correct path in git checkout for LuaRocks installer

Author: alerque

Makefile

@@ -53,7 +53,7 @@ rockspecs/$(PACKAGE)-%-0.rockspec: $(PACKAGE).rockspec.in
 	$(rockpec_template)
 	sed -i \
 		-e '/rockspec_format/s/3.0/1.0/' \
-		-e '/url = "git/a\   dir = "fluent.lua",' \
+		-e '/url = "git/a\   dir = "fluent-lua",' \
 		-e '/issues_url/d' \
 		-e '/maintainer/d' \
 		-e '/labels/d' \