Soften black dependency. (#416)

Author: christhekeele

pyproject.toml

@@ -24,7 +24,7 @@ jinja2 = "^3.0.0"
 typer = "^0.3"
 colorama = {version = "^0.4.3", markers = "sys_platform == 'win32'"}
 shellingham = "^1.3.2"
-black = "^21.4b0"
+black = "*"
 isort = "^5.0.5"
 pyyaml = "^5.3.1"
 importlib_metadata = {version = "^2.0.0", python = "<3.8"}