Update README.md

Author: jcs090218

README.md

@@ -24,7 +24,7 @@ Place the following line in your config file:
 ## 🛠️ Contribute
 
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+[![Elisp styleguide](https://img.shields.io/badge/elisp-style%20guide-purple?logo=gnuemacs&logoColor=white)](https://github.com/bbatsov/emacs-lisp-style-guide)
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