MosaicNonce changed to signed Int64 #466
Description
To handle the change nonce in signed Int64 format
https://github.com/nemtech/catbuffer/blob/master/schemas/mosaic/mosaic_types.cats#L1
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To handle the change nonce in signed Int64 format
https://github.com/nemtech/catbuffer/blob/master/schemas/mosaic/mosaic_types.cats#L1