Update app.py

app.py

@@ -4,8 +4,11 @@ import sys
 def install(package):
     subprocess.check_call([sys.executable, "-m", "pip", "install", package])
 
-install('gradio')
+def upgrade(package):
+    subprocess.check_call([sys.executable, "-m", "pip", "install", "--upgrade", package])
+
 install('transformers')
+upgrade('gradio')
 
 import gradio as gr
 from transformers import AutoTokenizer, AutoModel