fix: fix typo in Path.mkdir exist_ok

nyacme/__main__.py

@@ -1,5 +1,4 @@
 import argparse
-from genericpath import exists
 import logging
 import os.path
 import shutil
@@ -77,7 +76,7 @@ def main() -> None:
             domain_key.chmod(0o440)
 
             all_dir = output_dir / 'all'
-            all_dir.mkdir(parents=True, exists_ok=True)
+            all_dir.mkdir(parents=True, exist_ok=True)
 
             all_pem = all_dir / f'{domain}.pem'
             all_key = all_dir / f'{domain}.pem.key'