Update to ROCKJACK — Rockjack Steam update #369399

ROCKJACK RELEASE NOTES version 0.2.2 - 2020-11-20 Fri Bumped version to 0.2.2. Added damage multiple based on difficulty level. Slightly increased explosion chance for radioactive asteroids. Changed ownership terms in README - the player only licenses ships instead of buying them. Made diamond asteroids blue. (Easier to see) Fixed textures for rapid fire and shield regeneration powerups. Changed the way the Sensor Scrambler works: When the player picks it up, it will now damage the ship's sensors for the life of the ship. Improved skill level configuration - replaced integer level with an enum and associated properties. Improved skill selection on Options screen - replaced checkboxes with a dropdown, with descriptive text.