[godot] Closes #2242, register SpineMesh2D.

spine-godot/spine_godot/register_types.cpp

@@ -93,6 +93,7 @@ void register_spine_godot_types() {
 	GDREGISTER_CLASS(SpineSkeletonDataResource);
 	GDREGISTER_CLASS(SpineAnimationMix);
 	GDREGISTER_CLASS(SpineSprite);
+	GDREGISTER_CLASS(SpineMesh2D);
 	GDREGISTER_CLASS(SpineSkeleton);
 	GDREGISTER_CLASS(SpineAnimationState);
 	GDREGISTER_CLASS(SpineAnimation);