v0.5.0

• Change: Poison upgrades overhauled:
  • Poison damage now has diminishing returns (duration still scales linearly)
  • new Weakness upgrades reduces damage dealt by poisoned enemies
  • Putrefaction upgrade is now significantly more powerful
  • new Hallucinogens upgrade makes severely poisoned enemies fight on your side
• Change: internal cleanup to UpgradeBag and Dot APIs
• Fix: crash when carrying upgraded weapons across level transitions