Update Notes for 0.4.3

Further Still: Survivors · published · build 9614722

0.4.3:
- New weapon: Katana
- 3 New powers: Unstable Power, Rage, Flashy Kill
- 2 New Characters: Leo & ...
- New NPC: Gambler (Initial implementation)
- Reworked monster spawns, wave modifiers
- Assorted balance tweaks and asset shifts