Arsenal boss Mikel Arteta has challenged his players to keep up their sensational form as they push for a first Premier League title in 20 years. The Gunners smashed six past Sheffield United on Monday to pick up their seventh league win in a row, scoring 31 in that time. Arsenal are now just two points off leaders Liverpool and one behind Manchester City ahead of the two rivals’ match at Anfield on Sunday. Arteta’s side can go top of the table for just under 24 hours at least if they beat Brentford at the Emirates on Saturday evening. Arsenal became the first team in English Football League h…