[1.9.0]HyperwalletBalance class does not have `amount` field

[ponkin]

For all the sdk versions up to 1.9.0 the class com.hyperwallet.clientsdk.model.HyperwalletBalance does not have amount field, which makes it completly unusable. Is it something that has been done intentionaly?
2.4.0...1.9.0#diff-4303a4cab4b475145d98cae655916fddd4d8fb7a46106ae75e1de51d9775533cL11