add: [misp_stix_converter] Global version argument added

- This answers the request in #66

Author: chrisr3d

misp_stix_converter/__init__.py

@@ -47,6 +47,10 @@ def _handle_return_message(traceback):
 
 def main():
     parser = argparse.ArgumentParser(description='Convert MISP <-> STIX')
+    parser.add_argument(
+        '-v', '--version', action='version',
+        version=f'{parser.prog} {__version__}'
+    )
     parser.add_argument(
         '--debug', action='store_true', help='Show errors and warnings'
     )