Update to v0.21

'Renosirp's League Tools' is now updated to version v0.21.

Only minor changes.
The icons for Udyr, Volibear, Hecarim, Dr. Mundo, and Kassadin have been updated since they were using the old icons.
Removed Sett from jungle and Veigar from support, as they don't really work well in these roles.
Nicest change in this update is the home page and the background for all pages has been updated to use the League colour scheme, and the home page info looks nicer.

TLDR: Minor tweaks + cleaner UI