docs: add @nyergler as a contributor

.all-contributorsrc

@@ -214,6 +214,15 @@
         "code",
         "design"
       ]
+    },
+    {
+      "login": "nyergler",
+      "name": "Nathan Yergler",
+      "avatar_url": "https://avatars.githubusercontent.com/u/510875?v=4",
+      "profile": "http://yergler.net/",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7

CONTRIBUTORS.md

@@ -35,6 +35,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
   </tr>
   <tr>
     <td align="center"><a href="https://github.com/QuentinFelix"><img src="https://avatars.githubusercontent.com/u/5288091?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Quentin FELIX</b></sub></a><br /><a href="https://github.com/freesewing/freesewing/commits?author=QuentinFelix" title="Code">💻</a> <a href="#design-QuentinFelix" title="Design">🎨</a></td>
+    <td align="center"><a href="http://yergler.net/"><img src="https://avatars.githubusercontent.com/u/510875?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Nathan Yergler</b></sub></a><br /><a href="https://github.com/freesewing/freesewing/commits?author=nyergler" title="Documentation">📖</a></td>
   </tr>
 </table>
 

CONTRIBUTORS_BADGE.md

@@ -1,4 +1,4 @@
 
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-22-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-23-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->