update README.md

Author: maucejo

README.md

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 [![Generic badge](https://img.shields.io/badge/Version-2.0.2-cornflowerblue.svg)]()
 [![MIT License](https://img.shields.io/badge/License-MIT-forestgreen)](https://github.com/maucejo/elsearticle/blob/main/LICENSE)
-[![User Manual](https://img.shields.io/badge/doc-.pdf-mediumpurple)](https://github.com/maucejo/elsearticle/blob/main/docs/manual.pdf)
+[![User Manual](https://img.shields.io/badge/doc-.pdf-mediumpurple)](https://github.com/maucejo/elsearticle/blob/4a2b814e137bae43b6457198846dec52ce2fae71/docs/manual.pdf)
 
 `elsearticle` is a Typst template that aims to mimic the Elsevier article LaTeX class, a.k.a. `elsarticle.cls`, provided by Elsevier to format manuscript properly for submission to their journals.