Add README and COPYING to 'zip' makefile target.

This ensures that the README and COPYING files are distributed with ABS.
Signed-off-by: Travis Willard <travis@archlinux.org>

Makefile

@@ -45,6 +45,8 @@ zip:
 	cp Makefile $(BUILDDIR)/abs/
 	cp abs $(BUILDDIR)/abs/
 	cp makeworld $(BUILDDIR)/abs/
+	cp README $(BUILDDIR)/abs/
+	cp COPYING $(BUILDDIR)/abs/
 	cp -R conf $(BUILDDIR)/abs/
 	cp -R prototypes $(BUILDDIR)/abs/
 	cd $(BUILDDIR) && tar czf abs.tar.gz "abs/"