DeprecationWarning: Invaid 'main' field in ...

```
(node:92392) [DEP0128] DeprecationWarning: Invalid 'main' field in '/Users/kghoon/work/woodong09/woodong09_servers/billing_service/node_modules/@bootpay/backend-js/package.json' of 'dist/bootpay.js'. Please either fix that or report it to the module author
```

패키지 포함 후 실행 시 위와 같은 warning message가 출력됩니다. 