Fix naming of the chapter dir

11_compose/demo/app/app.py

@@ -0,0 +1,13 @@
+from flask import Flask
+from redis import Redis
+
+app = Flask(__name__)
+redis = Redis(host='redis', port=6379)
+
+@app.route('/')
+def hello():
+    count = redis.incr('hits')
+    return 'Hello World! 该页面已被访问 {} 次。\n'.format(count)
+
+if __name__ == "__main__":
+    app.run(host="0.0.0.0", debug=True)