Update README.md

Author: jesusprubio

README.md

@@ -4,7 +4,7 @@ Troubleshoot problems with your Internet connection based on different
 [protocols](pkg/protocol.go) and well-known [public servers](pkg/servers.go).
 
 <div align="center">
-  <img alt="Logo" src="https://github.com/jesusprubio/up/assets/2753855/a9c6bdb5-ab53-4969-8b36-97896c09a090" width="50%">
+  <img alt="Logo" src="https://github.com/jesusprubio/up/assets/2753855/a9c6bdb5-ab53-4969-8b36-97896c09a090" width="70%">
 </div>
 [![GoDoc][doc-img]][doc] [![Build Status][ci-img]][ci] ![License](https://img.shields.io/github/license/jesusprubio/up)