Adds missing newline

Author: neatc0der

mkdocs_markmap/extension.py

@@ -107,4 +107,4 @@ def extendMarkdown(self, md: Markdown, md_globals: Dict[str, str]) -> None:
                     log.warning(f'detected pymdownx.superfences, but import is not working: {e}')
 
                 except Exception as e:
-                    log.error(f'unexpected error: {e}')
+                    log.error(f'unexpected error: {e}')