new version 2021

changes shared by Eyvind Bernhardsen :

• allow testing of non-Joy2B sticks
• buttons 2 and 3 only appear if they are present
• tweak and add decay to the sounds
• make the direction rose point in eight directions instead of four
  and other minor text changes

Versión 1.2

change of design of buttons on the screen

Versión 1.1

Compatible con ATARI 2600/XL/XE

Primera versión

1.0

Update README.md