chore: Include NOTICE in artifact (#50)

Author: michaeldowseza

package.json

@@ -13,7 +13,7 @@
   "scripts": {
     "prebuild": "rm -rf lib && mkdir lib",
     "build": "echo 'Nothing to build'",
-    "postbuild": "cp *.js README.md LICENSE package.json lib",
+    "postbuild": "cp *.js README.md LICENSE NOTICE package.json lib",
     "lint": "eslint .",
     "test": "tap",
     "prepare": "husky install"