Bump ccxt from 1.36.66 to 1.36.85

Bumps [ccxt](https://github.com/ccxt/ccxt) from 1.36.66 to 1.36.85.
- [Release notes](https://github.com/ccxt/ccxt/releases)
- [Changelog](https://github.com/ccxt/ccxt/blob/master/doc/exchanges-by-country.rst)
- [Commits](https://github.com/ccxt/ccxt/compare/1.36.66...1.36.85)

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,7 +1,7 @@
 numpy==1.19.2
 pandas==1.1.3
 
-ccxt==1.36.66
+ccxt==1.36.85
 multidict==4.7.6
 aiohttp==3.6.3
 SQLAlchemy==1.3.20