message: added map example
diff: import unreal_engine as ue
  -from unreal_engine.classes import Material, BlueprintFactory, Blueprint, Actor, Texture2D
  -from unreal_engine.structs import EdGraphPinType, Vector, Rotator
  +from unreal_engine.classes import Material, BlueprintFactory, Blueprint, Actor, Texture2D, SkeletalMesh
  +from unreal_engine.structs import EdGraphPinType, Vector, Rotator, EdGraphTerminalType
  from unreal_engine.enums import EPinContainerType
  import time
  @@ -20,4 +20,7 @@ ue.blueprint_add_member_variable(bp, 'TestVector', pin)
  pin = EdGraphPinType(PinCategory='struct',PinSubCategoryObject=Rotator,ContainerType=EPinContainerType.Array)
  ue.blueprint_add_member_variable(bp, 'TestRotator', pin)
  +pin = EdGraphPinType(PinCategory='string',ContainerType=EPinContainerType.Map,PinValueType=EdGraphTerminalType(TerminalCategory='object',TerminalSubCategoryObject=SkeletalMesh))
  +ue.blueprint_add_member_variable(bp, 'TestMap', pin)
  +
  ue.open_editor_for_asset(bp)
  