Update black

Cito · Cito · commit 838da6df499b · 2021-04-26T11:44:25.000+02:00
diff --git a/poetry.lock b/poetry.lock
diff --git a/pyproject.toml b/pyproject.toml
@@ -49,7 +49,10 @@ pytest-benchmark = "^3.4"
 pytest-cov = "^2.10"
 pytest-describe = "^1.0"
 pytest-timeout = "^1.4"
-black = "20.8b1"
+black = [
+    {version = "20.8b1", python = "<3.6.2"},
+    {version = "21.4b0", python = ">=3.6.2"}
+]
 flake8 = "^3.9"
 mypy = "0.812"
 codecov = "^2"
diff --git a/tests/test_user_registry.py b/tests/test_user_registry.py
@@ -51,7 +51,7 @@ class MutationEnum(Enum):
 
 
 class UserRegistry:
-    """"Simulation of a user registry with asynchronous database backend access."""
+    """Simulation of a user registry with asynchronous database backend access."""
 
     def __init__(self, **users):
         self._registry: Dict[str, User] = users
diff --git a/tox.ini b/tox.ini
@@ -4,7 +4,7 @@ isolated_build = true
 
 [testenv:black]
 basepython = python3.8
-deps = black==20.8b1
+deps = black==21.4b0
 commands  =
     black src tests setup.py --check
 
