fix: correct typo in py code

Author: donbowman

README.md

@@ -18,7 +18,7 @@ k8s-validate [--kubernetes-version X.X.X] [--exclude glob-pattern] files
 
 Add a section similar to this to your .pre-commit-hooks.yaml:
   - repo: https://github.com/Agilicus/pre-commit-hook-k8svalidate.git
-    rev: v0.0.4
+    rev: v0.0.5
     hooks:
       - id: k8svalidate
         args: [--exclude, "*.patch.yaml"]

pre-commit-hooks/k8svalidate

@@ -7,7 +7,6 @@ SPDX-License-Identifier: Apache-2.0.
 import argparse
 import glob
 import itertools
-import os
 import sys
 
 import jsonschema
@@ -110,6 +109,6 @@ if __name__ == "__main__":
     rc = main()
     if not rc:
         print("Overall result: fail", file=sys.stderr)
-        os.exit(1)
+        sys.exit(1)
     else:
-        os.exit(0)
+        sys.exit(0)