Update app.py upload_file

app.py

@@ -4,8 +4,8 @@ from tablecv import extract_table
 img_name = st.file_uploader("Upload an image with table(s)")
 if img_name is not None:
    st.image(img_name)
-   with open(uploaded_file.name, "wb") as f:
-        f.write(uploaded_file.getbuffer())
+   with open(img_name.name, "wb") as f:
+        f.write(img_name.getbuffer())
    extracted_tables = extract_table(image_path=img_name.name)
 
    @st.experimental_memo