Merge pull request #7 from cainux/master

Changes to make this work on Windows as well.

package.json

@@ -8,12 +8,14 @@
     "rollup-plugin-node-resolve": "^3.0.3",
     "rollup-plugin-svelte": "^4.0.0",
     "rollup-plugin-uglify": "^3.0.0",
+    "npm-run-all": "^4.1.3",
     "serve": "^6.5.6",
     "svelte": "^2.6.0"
   },
   "scripts": {
     "build": "rollup -c",
-    "dev": "serve public & rollup -c -w",
+    "autobuild": "rollup -c -w",
+    "dev": "run-p start autobuild",
     "start": "serve public"
   }
 }