MatrixBot
- Updated README.md - Updated examples - `MatrixBot` does not redefine methods from classes it is composed of anymore
- Added example `file_bot.py` - Added *.tmp to .gitignore - Added CTX_FILE_SIZE, CTX_FILE_MIME and CTX_FILE_NAME - Added MessageHasFile filter - Added `send_file` and `send_file_bytes` for ClientSender and Bot