add mbattistini as a contributor for bug (OpenMage#4608)

* update README.md

* update .all-contributorsrc

---------

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Author: allcontributors[bot]

.all-contributorsrc

@@ -1517,6 +1517,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "mbattistini",
+      "name": "mbattistini",
+      "avatar_url": "https://avatars.githubusercontent.com/u/276468?v=4",
+      "profile": "https://github.com/mbattistini",
+      "contributions": [
+        "bug"
+      ]
     }
   ],
   "commitType": "docs"

README.md

@@ -249,6 +249,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/ragnese"><img src="https://avatars.githubusercontent.com/u/7927565?v=4" loading="lazy" width="100" alt=""/><br /><sub><b>Rob Agnese</b></sub></a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://www.cartware.de"><img src="https://avatars.githubusercontent.com/u/1931120?v=4" loading="lazy" width="100" alt=""/><br /><sub><b>Alexander Buch</b></sub></a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/mbattistini"><img src="https://avatars.githubusercontent.com/u/276468?v=4" loading="lazy" width="100" alt=""/><br /><sub><b>mbattistini</b></sub></a></td>
     </tr>
   </tbody>
 </table>