Tgcli

Added
- `location` to `send` in cli

Changed
- Updated documentation for `location`

Added
- `poll` section to *Bot* documentation

Changed
- `send` is now a group type of command which has `message`, `file` and `poll`
subcommands.
- Moved file sending functionality from `send` to `send file`
- Moved message sending functionality from `send` to `send message`
- `send` now only takes receiver chat id, other subcommands take related
options and parameters
- Updated *Bot* section of documentation

Added
- Downloads counter to README

Changed
- Changes status from beta to stable

Removed
- Status badge from README

Changed
- Changed documentation theme to material.
- Fixed issues on documentation.

Changed
- Download URL on `setup.py` now redirects to corresponding version `tar.gz`
archive.

Added
- Added `--as` flag to define the file type you sent.