Add gate.io to list of supported exchanges

README.md

@@ -30,6 +30,7 @@ Please read the [exchange specific notes](docs/exchanges.md) to learn about even
 - [X] [Bittrex](https://bittrex.com/)
 - [X] [Kraken](https://kraken.com/)
 - [X] [FTX](https://ftx.com)
+- [X] [Gate.io](https://www.gate.io/ref/6266643)
 - [ ] [potentially many others](https://github.com/ccxt/ccxt/). _(We cannot guarantee they will work)_
 
 ### Community tested

docs/index.md

@@ -40,6 +40,7 @@ Please read the [exchange specific notes](exchanges.md) to learn about eventual,
 - [X] [Bittrex](https://bittrex.com/)
 - [X] [FTX](https://ftx.com)
 - [X] [Kraken](https://kraken.com/)
+- [X] [Gate.io](https://www.gate.io/ref/6266643)
 - [ ] [potentially many others through <img alt="ccxt" width="30px" src="assets/ccxt-logo.svg" />](https://github.com/ccxt/ccxt/). _(We cannot guarantee they will work)_
 
 ### Community tested

freqtrade/exchange/gateio.py

@@ -21,3 +21,5 @@ class Gateio(Exchange):
     _ft_has: Dict = {
         "ohlcv_candle_limit": 1000,
     }
+
+    _headers = {'X-Gate-Channel-Id': 'freqtrade'}