Add price diapason (for limit order) in Market structure

[ttodua]

Operating System

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Programming Languages

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CCXT Version

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Description

for example, if Pair's price is 5$, on some exchanges limit price can't be placed below 4.5$, and they have such information available (i.e. 10%). so we should add those "percentage diapason" fields in market>limits.

Code

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