Update 20w21a

Hello everyone, here's a new update to the asset pack! If there are any icons that you would like added please leave a comment or post.

Any suggestion does not have to only be keys I'm open to any type of icon suggestion.

Changelog:

* Added Up Arrow Key Icon

* Added Right Arrow Key Icon

* Added Down Arrow Key Icon

* Added Left Arrow Key Icon

As always thanks for downloading.

-Sincerely Code Crash