Update README.md

Author: v0di

README.md

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 ![GitHub last commit](https://img.shields.io/github/last-commit/v0di/LeetCodeExercises)
-<a href="leetcode.com" target="_blank"><img alt="Website" src="https://img.shields.io/website?down_color=red&down_message=offline&up_color=blue&up_message=leetcode.com&url=https%3A%2F%2Fleetcode.com%2F"></a>
+<a href="https://leetcode.com" target="_blank"><img alt="Website" src="https://img.shields.io/website?down_color=red&down_message=offline&up_color=blue&up_message=leetcode.com&url=https%3A%2F%2Fleetcode.com%2F"></a>
 # LeetCodeExercises
 Solutions in Python for some of the problems on leetcode.com.