Fixing dataset upload issue

app.py

@@ -1,9 +1,8 @@
 import pandas as pd
 import plotly.graph_objects as go
+from datasets import load_dataset
 
-
-# read data
-plotly_data = pd.read_csv('plotly_data.csv')
+plotly_data = load_dataset('plotly_data.csv')
 
 # find countries in G20
 g20 = ['Argentina', 'Australia', 'Brazil', 'Canada', 'China', 'France', 'Germany', 'India', 'Indonesia', 'Italy', 'Japan', 'Republic of Korea', 'Mexico', 'Russia', 'Saudi Arabia', 'South Africa', 'Turkey', 'United Kingdom', 'United States', 'Austria', 'Belgium', 'Bulgaria', 'Croatia', 'Cyprus', 'Czech Republic', 'Denmark', 'Estonia', 'Finland', 'Greece', 'Hungary', 'Ireland', 'Latvia', 'Lithuania', 'Luxembourg', 'Malta', 'Netherlands', 'Poland', 'Portugal', 'Romania', 'Slovakia', 'Slovenia', 'Spain', 'Sweden']