add some debug lines.

src/wikiq/resume.py

@@ -168,6 +168,7 @@ def get_jsonl_resume_point(output_file, input_file=None):
             from wikiq import get_output_filename
             jsonl_filename = os.path.basename(get_output_filename(input_file, 'jsonl'))
             output_file = os.path.join(output_file, jsonl_filename)
+            print(f"Looking for resume point in: {output_file}", file=sys.stderr)
         else:
             return None