ZB fetchFundingRateHistory
ZB fetchFundingRateHistory

Added fetchFundingRateHistory to ZB:
```
zb.fetchFundingRateHistory (BTC/USDT:USDT)
447 ms
       symbol | fundingRate |     timestamp |                 datetime
----------------------------------------------------------------------
BTC/USDT:USDT |      0.0001 | 1642348800000 | 2022-01-16T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642377600000 | 2022-01-17T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642406400000 | 2022-01-17T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642435200000 | 2022-01-17T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642464000000 | 2022-01-18T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642492800000 | 2022-01-18T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642521600000 | 2022-01-18T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642550400000 | 2022-01-19T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642579200000 | 2022-01-19T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642608000000 | 2022-01-19T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642636800000 | 2022-01-20T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642665600000 | 2022-01-20T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642694400000 | 2022-01-20T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642723200000 | 2022-01-21T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642752000000 | 2022-01-21T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642780800000 | 2022-01-21T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642809600000 | 2022-01-22T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642838400000 | 2022-01-22T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642867200000 | 2022-01-22T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642896000000 | 2022-01-23T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642924800000 | 2022-01-23T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642953600000 | 2022-01-23T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1642982400000 | 2022-01-24T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643011200000 | 2022-01-24T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643040000000 | 2022-01-24T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643068800000 | 2022-01-25T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643097600000 | 2022-01-25T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643126400000 | 2022-01-25T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643155200000 | 2022-01-26T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643184000000 | 2022-01-26T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643212800000 | 2022-01-26T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643241600000 | 2022-01-27T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643270400000 | 2022-01-27T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643299200000 | 2022-01-27T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643328000000 | 2022-01-28T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643356800000 | 2022-01-28T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643385600000 | 2022-01-28T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643414400000 | 2022-01-29T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643443200000 | 2022-01-29T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643472000000 | 2022-01-29T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643500800000 | 2022-01-30T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643529600000 | 2022-01-30T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643558400000 | 2022-01-30T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643558460000 | 2022-01-30T16:01:00.000Z
BTC/USDT:USDT |      0.0001 | 1643587200000 | 2022-01-31T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643616000000 | 2022-01-31T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643644800000 | 2022-01-31T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643673600000 | 2022-02-01T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643702400000 | 2022-02-01T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643731200000 | 2022-02-01T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643760000000 | 2022-02-02T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643788800000 | 2022-02-02T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643817600000 | 2022-02-02T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643846400000 | 2022-02-03T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643875200000 | 2022-02-03T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643904000000 | 2022-02-03T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643932800000 | 2022-02-04T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643961600000 | 2022-02-04T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1643990400000 | 2022-02-04T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644019200000 | 2022-02-05T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644048000000 | 2022-02-05T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644076800000 | 2022-02-05T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644105600000 | 2022-02-06T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644134400000 | 2022-02-06T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644163200000 | 2022-02-06T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644192000000 | 2022-02-07T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644220800000 | 2022-02-07T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644249600000 | 2022-02-07T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644278400000 | 2022-02-08T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644307200000 | 2022-02-08T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644336000000 | 2022-02-08T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644364800000 | 2022-02-09T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644393600000 | 2022-02-09T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644422400000 | 2022-02-09T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644451200000 | 2022-02-10T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644480000000 | 2022-02-10T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644508800000 | 2022-02-10T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644537600000 | 2022-02-11T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644566400000 | 2022-02-11T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644595200000 | 2022-02-11T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644624000000 | 2022-02-12T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644652800000 | 2022-02-12T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644681600000 | 2022-02-12T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644710400000 | 2022-02-13T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644739200000 | 2022-02-13T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644768000000 | 2022-02-13T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644796800000 | 2022-02-14T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644825600000 | 2022-02-14T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644854400000 | 2022-02-14T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644883200000 | 2022-02-15T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644912000000 | 2022-02-15T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644940800000 | 2022-02-15T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644969600000 | 2022-02-16T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1644998400000 | 2022-02-16T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1645027200000 | 2022-02-16T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1645056000000 | 2022-02-17T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1645084800000 | 2022-02-17T08:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1645113600000 | 2022-02-17T16:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1645142400000 | 2022-02-18T00:00:00.000Z
BTC/USDT:USDT |      0.0001 | 1645171200000 | 2022-02-18T08:00:00.000Z
100 objects
```

ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt,ccxt/ccxt