[cexio] metadata - fixed min amount (reverting https://github.com/npomfret/XChange/commit/bbbe4494c2d3e99140d8be155e40de311bc4206e)
[cexio] metadata - fixed min amount (reverting https://github.com/npomfret/XChange/commit/bbbe4494c2d3e99140d8be155e40de311bc4206e)

douggie/XChange