Update app.py

app.py

@@ -1,11 +1,7 @@
 #### ignore these lines -- just needed to install and build a particular branch
 import os
 os.system("pip uninstall -y gradio")
-os.system("git clone https://github.com/gradio-app/gradio.git gradio")
-os.system("cd gradio && git fetch && git checkout flagging-spaces && pip install -e .")
-os.system("cd gradio/frontend && npm install && npm run build")
-import site
-site.main()
+os.system("pip install gradio==2.5.8a0")
 ### Real code is below
 ### -------------------------
 import gradio as gr