docs: Update badges [skip ci]

Author: amclin

README.md

@@ -5,7 +5,7 @@
 ## Status
 
 ### 2021
-![](https://img.shields.io/badge/day%20📅-15-blue)
+![](https://img.shields.io/badge/day%20📅-16-blue)
 ![](https://img.shields.io/badge/stars%20⭐-14-yellow)
 ![](https://img.shields.io/badge/days%20completed-7-red)