Update requirements.txt

requirements.txt

@@ -1,5 +1,5 @@
-streamlit==1.26.0       # Core library for the Streamlit web app
-pandas==2.1.1           # For handling and processing tabular dataset
-requests==2.31.0        # For downloading dataset from Google Drive
-openpyxl==3.1.2         # For processing Excel files
-plotly==5.15.0          # For creating interactive 3D visualizations
+streamlit==1.26.0
+pandas==2.1.1
+PyPDF2==3.0.1
+plotly==5.15.0
+requests==2.31.0