Particle effects not working in 1.10

testskill:
  Cooldown: 0.25
  Skills:
  - effect:particles{particle=flame;amount=200;hS=1;vS=1;speed=5}

test:
  Mobtype: zombie'
  Health: 25
  Damage: 3.5
  Equipment:
  DamageModifiers:
  - FALL 0
  - FIRE 0
  - FIRE_TICK 0
  Drops:
  Skills:
  - skill{skill=testskill 1 ~onTimer:20 @self