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MACDIndicatorValue has histogram and signal values reversed #517

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@ibcodemonkey

Description

@ibcodemonkey
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Describe the bug
The MACDIndicatorValue object create in response to python API call get_macd() has its histogram and signal values reversed. It appears the from_dict() deserializer either uses wrong labels or the variable assignment is incorrect.

To Reproduce
As an example the most recent MACDIndicatorValue returned by the call

client = RESTClient(api_key=“….”)
client.get_macd(ticker=“DBC”, timestamp_lte="2023-09-16", timespan=“week”, short_window=4, long_window=13, 
                                  signal_window=8, series_type="close")

is
MACDIndicatorValue(timestamp=1694318400000, value=0.6858891541204777, signal=0.23005417069090606,
histogram=0.4558349834295716)

Comparing with the values returned by a similar call to MACD with the same parameters in TradeView which yield:-
hist (histogram) = 0.2301
macd (value) = 0.6859
signal (signal) = 0.4558

Appears polygon has swapped its returned histogram and signal values. This, on the surface is confirmed by looking at the code
With respect to tag v1.12.4
File client-python/polygon/rest/models/indicators.py
Line 34 & 35
signal=d.get("histogram", None),
histogram=d.get("signal", None),

Expected behavior
Would expect the returned MACDIndicatorValue object in this situation to be :-

MACDIndicatorValue(timestamp=1694318400000, value=0.6858891541204777, histogram=0.23005417069090606, signal=0.4558349834295716)

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