Implement st.toast once the process is completed.

pages/3 Bidirected Network.py

@@ -84,7 +84,7 @@ if uploaded_file is not None:
     with col1:
         method = st.selectbox(
              'Choose method',
-           ('Stemming', 'Lemmatization'), on_change=reset_all)
+           ('Lemmatization', 'Stemming'), on_change=reset_all)
     with col2:
         keyword = st.selectbox(
             'Choose column',