当我升级到 mongoose 4.13.8 和 sendgrid 6.1.4 时出现此错误。试图了解如何解决我这边的问题，或者我是否需要恢复到一个或两个的先前版本？
(node:4862) DeprecationWarning: Mongoose: mpromise (mongoose's default promise library) is deprecated, plug in your own promise library instead: http://mongoosejs.com/docs/promises.html
(node:4862) UnhandledPromiseRejectionWarning: Error: Unauthorized
at Request.http [as _callback] (node_modules/@sendgrid/client/src/client.js:124:25)
at Request.self.callback (node_modules/request/request.js:186:22)
at Request.emit (events.js:159:13)
at Request.<anonymous> (node_modules/request/request.js:1163:10)
at Request.emit (events.js:159:13)
at IncomingMessage.<anonymous> (node_modules/request/request.js:1085:12)
at Object.onceWrapper (events.js:254:19)
at IncomingMessage.emit (events.js:164:20)
at endReadableNT (_stream_readable.js:1062:12)
at process._tickCallback (internal/process/next_tick.js:152:19)
(node:4862) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 1)
(node:4862) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
违规行似乎来自node_modules/@sendgrid/client/src/client.js:124:25，对吗？
该行在这里： https ://github.com/sendgrid/sendgrid-nodejs/blob/master/packages/client/src/client.js#L124
知道如何解决吗？我想我会回滚两者，直到我更好地理解问题！提前致谢！