Api get margin tiers response

ApiGetMarginTiersResponse

Name Lite	Type	Required Default	Description
results r	[AssetMarginTierResponse]	True

AssetMarginTierResponse

Name Lite	Type	Required Default	Description
asset a	string	True
tiers t	[MarginTierResponse]	True

MarginTierResponse

Name Lite	Type	Required Default	Description
lower_bound lb	string	True
rate r	string	True