[TypeScript] Add typings to allow http.Agent in options (#965)
[TypeScript] Add typings to allow http.Agent in options (#965)

* Add types to allow http.Agent in options

* Fix description of telegram.agent

Co-authored-by: Vitaly Domnikov <c5bf915c10c55b2586bef2d348b860c0b221058a@gmail.com>
telegraf/telegraf,telegraf/telegraf