Update README.md

Author: mrinal1704

README.md

@@ -5,6 +5,6 @@ This repo contains all my SQL solutions from Leetcode website in order to practi
 and I will be posting it here as I am done attempting them everyday.
 
 ## Description
-The Solutions are divided into three level of categories namely Easy, Medium, and Hard. Every category first contains the question and then followed by its respective solution.
+The solutions are divided into three level of categories namely Easy, Medium, and Hard. Every category first contains the question and then followed by its respective solution.
 Link to the website is: https://leetcode.com/problemset/database/