Update README.md

Author: jcs090218

README.md

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 <p align="center">
-   <a href="#"><img src="https://raw.githubusercontent.com/shader-ls/shader-language-server/master/etc/logo.png" width="20%"></a>
+   <a href="#"><img src="https://raw.githubusercontent.com/shader-ls/shader-language-server/master/etc/logo.png" width="30%"></a>
   <h1 align="center">Shader Language Server</h1>
   <p align="center">
     <a href="https://opensource.org/licenses/MIT"><img alt="License" src="https://img.shields.io/badge/License-MIT-green.svg"/></a>