build: add shebang line to cli

package.json

@@ -9,7 +9,7 @@
   "scripts": {
     "build": "npm run tslint && npm run compile && npm run documentation",
     "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0",
-    "compile": "tsc",
+    "compile": "tsc && sed -i '1i#!/usr/bin/env node' lib/cli.js",
     "documentation": "typedoc --includeDeclarations --excludeExternals --mode modules --out docs src",
     "prepareOnly": "npm run build",
     "tslint": "tslint 'src/**/*.ts'"