Build JS when creating dist.

Author: alexsegura

Makefile

@@ -1,6 +1,7 @@
 release-wordpress:
 	@mkdir -p dist/
 	@rm -f dist/coopcycle-$(VERSION).zip
+	@cd wordpress && npm run build && cd ..
 	@cd wordpress && git archive -o ../dist/wordpress-$(VERSION).zip HEAD && cd ..
 	@printf "\e[0;32mCreated release $(VERSION)\e[0m\n"