postinstall minified bundle

Author: vincentfrochot

package.json

@@ -37,7 +37,8 @@
     "format": "prettier --write .",
     "check-format": "prettier --check .",
     "bundle": "esbuild src/chessground.ts --bundle --format=esm --outfile=dist/chessground.min.js --minify",
-    "dist": "$npm_execpath run compile && $npm_execpath run bundle"
+    "dist": "$npm_execpath run compile && $npm_execpath run bundle",
+    "postinstall": "run bundle"
   },
   "files": [
     "/dist/*.js",