Bump black from 19.10b0 to 20.8b1

Bumps [black](https://github.com/psf/black) from 19.10b0 to 20.8b1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/master/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

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

Author: dependabot-preview[bot]

poetry.lock

@@ -23,7 +23,7 @@ flask-threaded-sockets = "^0.3.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.0"
-black = {version = "^19.10b0",allow-prereleases = true}
+black = {version = "^20.8b1",allow-prereleases = true}
 pytest-cov = "^2.10.1"
 numpy = "^1.19.1"
 jsonschema = "^3.2.0"