Update Animation_API.md

Author: Roberto De Ioris

docs/Animation_API.md

@@ -4,8 +4,11 @@
 You can control animation blueprints variables and events easily:
 
 ```py
+
+from unreal_engine.classes import SkeletalMeshComponent
+
 # get a reference to the skeletal mesh
-skeletal = self.uobject.get_component_by_type('SkeletalMeshComponent')
+skeletal = self.uobject.get_component_by_type(SkeletalMeshComponent)
 # get a reference to the animation class
 animation = skeletal.get_anim_instance()