add GravityAccel to GlowAnimal (#1084)
add GravityAccel to GlowAnimal (#1084)

* add GravityAccel to GlowAnimal

* Update GlowAnimal.java

* Update GlowAnimal.java

* Update GlowAnimal.java

* Update GlowAnimal.java

* Update GlowAnimal.java

GlowstoneMC/GlowstonePlusPlus,GlowstoneMC/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus,GlowstoneMC/GlowstonePlusPlus,GlowstoneMC/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus,GlowstonePlusPlus/GlowstonePlusPlus