Add support for a list of external proxies.
Add to Section 5 of the file config.txt option for the file that contains a list of proxy servers. For example:
forwarding-proxy-list ./proxy-list.txt # file with list of proxy servers
forwarding-proxy-time-to-change 30 # time in seconds to change active proxy-server
Proxy-list.txt file should contain a list of working proxies. For example: