catch unhandle promise rejections

[gtalusan]

My node-red instance will crash if the network/Internet disappears. This finds some spots with unhandled promise rejections.

4 Apr 00:35:03 - [info] node-red-contrib-telegrambot: WebHook listening on 0.0.0.0:8445
Unhandled rejection RequestError: Error: getaddrinfo EAI_AGAIN api.telegram.org
    at new RequestError (/data/node_modules/request-promise-core/lib/errors.js:14:15)
    at Request.plumbing.callback (/data/node_modules/request-promise-core/lib/plumbing.js:87:29)
    at Request.RP$callback [as _callback] (/data/node_modules/request-promise-core/lib/plumbing.js:46:31)
    at self.callback (/data/node_modules/@cypress/request/request.js:183:22)
    at Request.emit (node:events:524:28)
    at Request.onRequestError (/data/node_modules/@cypress/request/request.js:869:8)
    at ClientRequest.emit (node:events:524:28)
    at emitErrorEvent (node:_http_client:101:11)
    at TLSSocket.socketErrorListener (node:_http_client:504:5)
    at TLSSocket.emit (node:events:524:28)
    at emitErrorNT (node:internal/streams/destroy:169:8)
    at emitErrorCloseNT (node:internal/streams/destroy:128:3)
    at processTicksAndRejections (node:internal/process/task_queues:82:21)

[windkh]

@gtalusan thank you for your PR. Well done. I will add you to the credits list