Update volcano copyright.

src/components/farm/Board.jsx

@@ -882,7 +882,7 @@ class Misc extends React.Component {
                         <img src={TractorFullImg} /> <img src={TractorImg} /> Copyright Nick Roach with modifications by Thomas Hintz - License <a href='GPL http://www.gnu.org/copyleft/gpl.html'>GPL</a>
                     </li>
                     <li>
-                        <img src={VolcanoImg} /> Copyright <a href="https://thenounproject.com/Maludk/">Laymik</a> - <CCBY />
+                        <img src={VolcanoImg} /> Copyright <a href="https://thenounproject.com/Maludk/">Laymik</a> with modifications by Thomas Hintz - <CCBY />
                     </li>
                     <li>
                         <img src={CornImg} /> <img src={FruitImg} /> Copyright <a href='https://madexmade.com/'>Made</a> - <CCBY />