Support build-dev

Author: stevenjoezhang

package.json

@@ -5,7 +5,8 @@
   "main": "autoload.js",
   "type": "module",
   "scripts": {
-    "build": "rollup -c rollup.config.js -f iife | terser -c -m > waifu-tips.js"
+    "build": "rollup -c rollup.config.js -f iife | terser -c -m > waifu-tips.js",
+    "build-dev": "rollup -c rollup.config.js -f iife -o waifu-tips.js -w"
   },
   "repository": {
     "type": "git",