[requires.io] dependency update on master branch (#143)

Author: glyph

tox.ini

@@ -14,7 +14,7 @@ passenv =
 deps =
     pytest==6.0.1
     pytest-cov==2.10.1
-    pytest-xdist==2.0.0
+    pytest-xdist==2.1.0
 commands =
     pytest --cov-report=xml --cov-report=term --cov=wsproto {posargs}
 
@@ -30,7 +30,7 @@ commands =
 [testenv:format]
 basepython = python3.8
 deps =
-    black==19.10b0
+    black==20.8b1
     isort==5.4.2
 commands =
     black --check --diff src/ test/ example/ compliance/