Fixed encoding issues affecting python

[ci skip]

tidex camelcased their web API keys for currencies fix ccxt#2259

[ci skip]

anxpro null response on 304

[ci skip]

Remove non-existing cobinhood test urls

[ci skip]

another fix for the fix in bleutrade/bittrex parseTicker for empty ti…

…mestamps "" ccxt#2242

[ci skip]

added examples/py/bitmex-fetch-ohlcv-with-extra-params.py

[ci skip]

a little more readable cloudscraper error messaging in cli.js

[ci skip]

added more notes on custom params to the Manual here and there ccxt#2254



[ci skip]

minor edits

[ci skip]

ccex fetchMarkets → pairs.json fix ccxt#2246

[ci skip]