Merge pull request #62 from ISylvox/rubegoldberg-smallfix

Rubegoldberg/engine.cfg: Changed the deprecated 'default_density' to 'default_linear_damp'

2d/rubegoldberg/engine.cfg

@@ -7,4 +7,4 @@ icon="res://icon.png"
 [physics_2d]
 
 default_gravity=500
-default_density=0.01
+default_linear_damp=0.01