v0.6.0

• New: Fragmentation upgrade for projectile weapons
• New: Swiftness upgrade for melee weapons
• New: Acid elemental tree
  • Corrosive Shots adds a weak dot that gets more powerful as the target takes damage;
    it works best with slow-firing, high-damage weapons like the rockets and SSG
  • Acid Spray causes surplus acid to splash onto nearby enemies
  • Embrittlement makes acid stacks increase damage taken by enemies
  • Explosive Reaction turns acid stacks into an explosion on death
• New: weapons are limited to 2 elements, and must master the first before adding the second.
• Change: 2 basic levels are now required to unlock intermediate (and likewise for intermediate->master).
• Change: Documentation tweaks.
• Change: Redesign of damage-over-time API to support fractional stacks/durations.
• Change: Fire now applies stacks based on attack damage.
• Fix: Infinite recursion with some upgrade combinations
• Fix: Weakness upgrade could sometimes give enemies damage resistance.
• WIP: Beam upgrade for hitscan weapons
  • currently disabled due to bad interactions with other weapons