2.1.0

1. new CSV scheme (proxy,hostname,status,speed_category,response_time,country,city,anonymity,protocol,check_time)
2. add more JSON fields (hostname, speedcategory)
3. new filter arguments --filter-status, --filter-anonymity, --filter-protocol, --filter-country, --filter-tld
4. filter logic with AND/OR
5. refactoring of some functions and logic