* Add uniques to westmint and statemint * update cargo * Update Cargo.lock * Update lib.rs * fix merge * Apply suggestions from code review Co-authored-by: Alexander Popiak <alexander.popiak@parity.io> * fix build Co-authored-by: Alexander Popiak <alexander.popiak@parity.io> Co-authored-by: joepetrowski <joe@parity.io>