Update app.py

app.py

@@ -334,9 +334,5 @@ async def convert(
 
 if __name__ == "__main__":
     import uvicorn
-
-    uvicorn.run(
-        app,
-        host="0.0.0.0",
-        port=8000
-    )
+    port = int(os.environ.get("PORT", 7860))
+    uvicorn.run(app, host="0.0.0.0", port=port)