Patch notes

• Added a Katana melee weapon!
  
• Enemies can be hit much faster. - This buffs fast firing weapons but prevents non-piercing bullets from piercing anyway due to enemies having a lengthy "invincibility state" after being damaged
  
• Increased Shovel damage from 15 to 20
  
• Fixed Shovel knockback so it actually pushes zombies back much much further
  
• Increased Axe damage from 20 to 40
  
• The Ammo Cooler now alerts you when you are out of ammo
  
• Melee animation performance tweaks
  
• New effects on bullet collisions with enemies