added a clarification on const vs let vs var ccxt#4797

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1.18.345

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kucoin order size exception

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added a "Committing Changes To The Repository" section to CONTRIBUTIN…

…G.md

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hitbtc2 linting

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hitbtc2 fetchTradingFees ccxt#4780

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bittrex fetchDepositAddress LSK fix ccxt#4794

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bitstamp parseTrade edits

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dsx createDepositAddress/fetchDepositAddress edits

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1.18.337

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