chore(README.md): Update all shields.io badges

Updated all `shields.io` badges to `flat square` style

Author: raklaptudirm

README.md

@@ -2,7 +2,7 @@
 
 
 [![contributions welcome](https://img.shields.io/static/v1.svg?label=Contributions&message=Welcome&color=0059b3&style=flat-square)](https://github.com/TheAlgorithms/Javascript/blob/master/CONTRIBUTING.md) 
-[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/TheAlgorithms/Javascript.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/TheAlgorithms/Javascript/context:javascript)
+[![Language grade: JavaScript](https://img.shields.io/lgtm/grade/javascript/g/TheAlgorithms/Javascript.svg?logo=lgtm&logoWidth=18&style=flat-square)](https://lgtm.com/projects/g/TheAlgorithms/Javascript/context:javascript)
 ![Node CI](https://github.com/TheAlgorithms/Javascript/workflows/Node%20CI/badge.svg)
 ![update_directory_md](https://github.com/TheAlgorithms/Javascript/workflows/update_directory_md/badge.svg)
 ![](https://img.shields.io/github/repo-size/TheAlgorithms/Javascript.svg?label=Repo%20size&style=flat-square)