Fiberhttp

**Fix proxy authorization**
- Removed proxy authorization from raw request
- Imporve sending request in socket connection
- Add benchmarks in main README.md

**Added auto reconnect feauter**
- Auto reconnect if send request in closed connection

**Added Exceptions**
- Added _exceptions file in source folder

**Added Json Argument**
- Added Json Argument in request
- Added Json content type in default headers

**Added Preparing Requests Feature**
- Imporve sending requests
- Imporve SSL Security
- Added fiberhttp.Request() feature
- Removed `build` and `build_proxy` Functions
- Removed `host` argument from `send` Function

**Support Upload & Download Files**
- Imporve reading response
- Added respones.content() feature to save files