Update README.md

Author: saudzahirr

README.md

@@ -2,4 +2,4 @@
 ![image](https://user-images.githubusercontent.com/76210541/126907159-255ab7da-4040-46b1-8a8b-ef32608744b8.png)
 
 ### Starting Out with Python (4th Edition) By Tony Gaddis. <br/>
-This repository contains the source code of excercise question which I did during COVID-19 vacations.
+This repository contains the source code of excercise questions which I did during COVID-19 vacations.