Update README.md

Author: codeesura

README.md

@@ -29,7 +29,7 @@
 <br />
 <div align="center">
   <a href="https://github.com/codeesura/dijkstra-algorithm">
-    <img src="image/logo.png" alt="Logo" width="80" height="80">
+    <img src="image/logo.png" alt="Logo" width="250" height="250">
   </a>
 
   <h3 align="center">Dijkstra Algorithm Implementation</h3>