use master branch on build

Author: yyx990803

Makefile

@@ -8,7 +8,7 @@ deploy:
 update:
 	cd ../vue && \
 		git checkout -- dist && \
-		git checkout dev && \
+		git checkout master && \
 		npm run build
 	cp ../vue/dist/vue.min.js themes/vue/source/js/vue.min.js
 	cp ../vue/dist/vue.js themes/vue/source/js/vue.js