Update app.py

app.py

@@ -6,10 +6,11 @@
 
 # Updated to account for UI changes from https://github.com/rkfg/audiocraft/blob/long/app.py
 # also released under the MIT license.
-
+import os
+command = "pip install --upgrade pip; pip3 install --trusted-host pypi.python.org --no-cache-dir -r req.txt"
+os.system(command)
 import argparse
 from concurrent.futures import ProcessPoolExecutor
-import os
 from pathlib import Path
 import subprocess as sp
 from tempfile import NamedTemporaryFile