Upgrade black to 21.4b1

Author: macbre

poetry.lock

@@ -13,11 +13,11 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.6"
+python = "^3.6.2"
 sqlparse = "^0.4.1"
 
 [tool.poetry.dev-dependencies]
-black = "^20.8b1"
+black = "^21.4b1"
 coverage = "^5.5"
 pylint = "^2.8.2"
 pytest = "^6.2.3"