[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

README.md

@@ -196,6 +196,7 @@ env = Env()
 # A single validator function
 NAME = env.str("NAME", validate=lambda n: n.startswith("Harry"))
 
+
 # A validator function can signal error by raising an exception
 def is_positive(num):
     if num <= 0: