Upgrade lxml to 4.1.1
Upgrade lxml to 4.1.1

Closes #1194

proevo/pythondotorg,python/pythondotorg,manhhomienbienthuy/pythondotorg,proevo/pythondotorg,python/pythondotorg,manhhomienbienthuy/pythondotorg,proevo/pythondotorg,manhhomienbienthuy/pythondotorg,proevo/pythondotorg,manhhomienbienthuy/pythondotorg,python/pythondotorg,python/pythondotorg