:truck: Use snake case naming convention

For resource.

godot/effect/particle/impact/Impact.tscn

@@ -1,9 +1,10 @@
 [gd_scene load_steps=4 format=2]
 
 [ext_resource path="res://effect/particle/impact/impact_particle.png" type="Texture" id=1]
-[ext_resource path="res://effect/particle/impact/ImpactMaterial.tres" type="Material" id=2]
+[ext_resource path="res://effect/particle/impact/impact_material.tres" type="Material" id=2]
 [ext_resource path="res://effect/particle/impact/Impact.gd" type="Script" id=3]
 
+
 [node name="ImpactSplash" type="Particles2D"]
 emitting = false
 amount = 9