Fix "cancellation of promises is deprecated" error
Fix "cancellation of promises is deprecated" error

See:
  1. https://github.com/yagop/node-telegram-bot-api/issues/319
  2. https://github.com/yagop/node-telegram-bot-api/issues/484

EXL/DigestBot,EXL/DigestBot,EXL/DigestBot,EXL/DigestBot