Update README.md

Some places to work late nearby or slightly further afield: 

Aobaba
57 Kingsland Road,
E2 8AG
http://www.aobaba.com
Opening hours: Daily 11am - 11pm
Comments : Open late, really quiet, decent enough wifi. 

Barbican Arts Centre (Camera Cafe & Bar)
Silk St
EC2Y 8DS
http://www.barbican.org.uk/restaurants-bars/opening-hours
Opening hours: Mon–Fri: 8am–10.30pm; Sat & Sun: 10am–10.30pm
Comments: 

Full Stop Bar 
202 Brick Lane
E1 6SA 
Opening hours :  Mon - Tue: 07:30 - 18:00; Wed - Thu: 07:30 - 23:00; Fri: 07:30 - 00:30; Sat: 09:00 - 00:30; Sun: 09:00 - 21:00
https://www.facebook.com/fullstopbar
Comments: Despite being a bar, there appears to be a cafe attached that is open til late.

Look Mum, No Hands!
49 Old Street
EC1V 9HX
Opening hours : Mon–Fri  07:30–22:00; Sat  09:00–22:00; Sun  09:30–22:00
http://www.lookmumnohands.com
Comments: Bike friendly, wifi a little hit and miss, food and drink is a little pricey, but has a nice vibe.

Shoreditch Grind
213 Old Street
EC1V 9NR

Old  Street tube exit 8
Opening hours : Mon–Thurs 7:00 - 23:00; Fri 7:00- 1:00.
Sat 8:00 - 1:00. Sun 9:00 - 7:00
http://www.shoreditchgrind.com

Comments: No wifi in the evening.