docs: add Berkmann18 as a contributor (#17)

* docs: update README.md

* docs: update .all-contributorsrc

Author: allcontributors[bot]

.all-contributorsrc

@@ -19,7 +19,11 @@
         "code",
         "doc",
         "ideas",
-        "maintenance"
+        "maintenance",
+        "platform",
+        "infra",
+        "test",
+        "security"
       ]
     }
   ],

README.md

@@ -549,11 +549,12 @@ Returns **[ConfusionMatrix](#confusionmatrix)** Filled confusion matrix
 ## Contributors
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
-
 <!-- prettier-ignore -->
-Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
-
-<table><tr><td align="center"><a href="http://maxcubing.wordpress.com"><img src="https://avatars0.githubusercontent.com/u/8260834?v=4" width="100px;" alt="Maximilian Berkmann"/><br /><sub><b>Maximilian Berkmann</b></sub></a><br /><a href="https://github.com/Berkmann18/json-fixer/commits?author=Berkmann18" title="Code">💻</a> <a href="https://github.com/Berkmann18/json-fixer/commits?author=Berkmann18" title="Documentation">📖</a> <a href="#ideas-Berkmann18" title="Ideas, Planning, & Feedback">🤔</a> <a href="#maintenance-Berkmann18" title="Maintenance">🚧</a></td></tr></table>
+<table>
+  <tr>
+    <td align="center"><a href="http://maxcubing.wordpress.com"><img src="https://avatars0.githubusercontent.com/u/8260834?v=4" width="100px;" alt="Maximilian Berkmann"/><br /><sub><b>Maximilian Berkmann</b></sub></a><br /><a href="https://github.com/all-contributors/ac-learn/commits?author=Berkmann18" title="Code">💻</a> <a href="https://github.com/all-contributors/ac-learn/commits?author=Berkmann18" title="Documentation">📖</a> <a href="#ideas-Berkmann18" title="Ideas, Planning, & Feedback">🤔</a> <a href="#maintenance-Berkmann18" title="Maintenance">🚧</a> <a href="#platform-Berkmann18" title="Packaging/porting to new platform">📦</a> <a href="#infra-Berkmann18" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/all-contributors/ac-learn/commits?author=Berkmann18" title="Tests">⚠️</a> <a href="#security-Berkmann18" title="Security">🛡️</a></td>
+  </tr>
+</table>
 
 <!-- ALL-CONTRIBUTORS-LIST:END -->