Free-proxy

- Fixed https parameter error
- Fixed additional loop issue when no proxy was found

- Added new website to get proxies from: <https://free-proxy-list.net>
- Added new website to get proxies from: <https://free-proxy-list.net/uk-proxy.html>
- Added new website to get proxies from: <https://www.us-proxy.org/>
- Change lxml version to 4.9.1

- Added `google` parameter
- Added `https` parameter

- Added `elite` parameter
- Add exception class and raise exception instead of system exit
- Change lxml version to 4.6.5

- Fix proxy list default length

- Change XPatch due to SSL proxies page update
- Change lxml version