docs: add @ad-m as a contributor

Author: tunnckoCore

.all-contributorsrc

@@ -102,6 +102,16 @@
         "ideas",
         "maintenance"
       ]
+    },
+    {
+      "login": "ad-m",
+      "name": "Adam Dobrawy",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/3618479?v=4",
+      "profile": "http://ochrona.jawne.info.pl",
+      "contributions": [
+        "bug",
+        "doc"
+      ]
     }
   ]
 }

README.md

@@ -404,6 +404,9 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/Amit-A"><img src="https://avatars1.githubusercontent.com/u/7987238?v=4" width="100px;" alt=""/><br /><sub><b>Amit-A</b></sub></a><br /><a href="#question-Amit-A" title="Answering Questions">💬</a> <a href="https://github.com/node-formidable/node-formidable/issues?q=author%3AAmit-A" title="Bug reports">🐛</a> <a href="https://github.com/node-formidable/node-formidable/commits?author=Amit-A" title="Code">💻</a></td>
     <td align="center"><a href="https://charmander.me/"><img src="https://avatars1.githubusercontent.com/u/1889843?v=4" width="100px;" alt=""/><br /><sub><b>Charmander</b></sub></a><br /><a href="#question-charmander" title="Answering Questions">💬</a> <a href="https://github.com/node-formidable/node-formidable/issues?q=author%3Acharmander" title="Bug reports">🐛</a> <a href="https://github.com/node-formidable/node-formidable/commits?author=charmander" title="Code">💻</a> <a href="#ideas-charmander" title="Ideas, Planning, & Feedback">🤔</a> <a href="#maintenance-charmander" title="Maintenance">🚧</a></td>
   </tr>
+  <tr>
+    <td align="center"><a href="http://ochrona.jawne.info.pl"><img src="https://avatars1.githubusercontent.com/u/3618479?v=4" width="100px;" alt=""/><br /><sub><b>Adam Dobrawy</b></sub></a><br /><a href="https://github.com/node-formidable/node-formidable/issues?q=author%3Aad-m" title="Bug reports">🐛</a> <a href="https://github.com/node-formidable/node-formidable/commits?author=ad-m" title="Documentation">📖</a></td>
+  </tr>
 </table>
 
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