Update README.md

Author: kelvins

README.md

@@ -73,7 +73,7 @@ In order to achieve greater coverage and encourage more people to contribute to
             </td>
             <td> <!-- C++ -->
                 <a href="./src/cpp/Dijkstras_MinHeap.cpp">
-                    <img align="center" height="25" src="./logos/github.svg" />
+                    <img align="center" height="25" src="./logos/cplusplus.svg" />
                 </a>
             </td>
             <td> <!-- Java -->