Update app_parallel.py

app_parallel.py

@@ -362,7 +362,7 @@ def parallel_processing():
 @app.route("/stream", methods=["GET"])
 def stream_results():
     global future_to_chunk
-     def generate():
+    def generate():
         for future in as_completed(future_to_chunk):
             idx = future_to_chunk[future]
             try: