Permanent Database, Multiple connections and Lot more...

Hi Abir, First of all thanks for this awesome repo. Please take a look at these missing features if you have time to upgrade this repo.

* Highest performance (up to 200 msg/min)
* Forward from many chats to one and vice versa
* Permanent Database support with MongoDB

Implementation of **MongoDB** will be very helpful to remember the last forward message id (Especially for Kanging thread) to avoid the incomplete clone of the desired channel(s) after the heroku dyno auto-restart. Yes I know Telegram bans the account without any prompt, but it's hassle-free after the recovery. So please increase the message forward rate to an optimal amount for better performance. And also multiple connection (within channels) feature is a better one too.

Thank you!