Modified app.py and mended requirements

app.py

@@ -1,10 +1,9 @@
-# pip install streamlit fbprophet yfinance plotly
 import streamlit as st
 from datetime import date
 
 import yfinance as yf
-from fbprophet import Prophet
-from fbprophet.plot import plot_plotly
+from prophet import Prophet
+from prophet.plot import plot_plotly
 from plotly import graph_objs as go
 
 START = "2015-01-01"
@@ -19,7 +18,7 @@ n_years = st.slider('Years of prediction:', 1, 4)
 period = n_years * 365
 
 
-@st.cache
+@st.cache_data
 def load_data(ticker):
     data = yf.download(ticker, START, TODAY)
     data.reset_index(inplace=True)