Update sigma-gen.py (#34)

Change date format to ISO 8601 date with separator format : YYYY-MM-DD
Source: https://github.com/SigmaHQ/sigma-specification/blob/main/specification/sigma-rules-specification.md#date

bin/sigma-gen.py

@@ -76,7 +76,7 @@ def generate_sigma_rules(yaml_file: str, output_dir: str) -> List[Dict[str, Any]
                 "status": "experimental",
                 "description": f"Detects potential {artifact_type} activity of {name} RMM tool",
                 "author": "LOLRMM Project",
-                "date": date.today().strftime('%Y/%m/%d'),
+                "date": date.today().strftime('%Y-%m-%d'),
                 "tags": ["attack.execution", "attack.t1219"],
                 "falsepositives": [f"Legitimate use of {name}"],
                 "level": "medium",
@@ -135,4 +135,4 @@ def main() -> None:
     print(f"[+] Sigma rule generation and YAML update complete. Files saved in {output_dir}")
 
 if __name__ == "__main__":
-    main()
+    main()