build(package): build script

Author: gr2m

package.json

@@ -4,7 +4,8 @@
   "private": true,
   "description": "Probot & GitHub Action example",
   "scripts": {
-    "test": "node test.js"
+    "test": "node test.js",
+    "build": "ncc build index.js -o dist"
   },
   "author": "Gregor Martynus (https://twitter.com/gr2m)",
   "license": "ISC",