Add JoshuaKGoldberg as contributor

Followup to #42

Author: JoyceZhu

README.md

@@ -98,6 +98,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/kendallgassner"><img src="https://avatars.githubusercontent.com/u/15275462?v=4?s=100" width="100px;" alt="Kendall Gassner"/><br /><sub><b>Kendall Gassner</b></sub></a><br /><a href="https://github.com/kendallgassner/accessibility-alt-text-bot/commits?author=kendallgassner" title="Code">💻</a> <a href="#a11y-kendallgassner" title="Accessibility">️️️️♿️</a> <a href="https://github.com/kendallgassner/accessibility-alt-text-bot/commits?author=kendallgassner" title="Documentation">📖</a> <a href="#infra-kendallgassner" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/khiga8"><img src="https://avatars.githubusercontent.com/u/16447748?v=4?s=100" width="100px;" alt="Kate Higa"/><br /><sub><b>Kate Higa</b></sub></a><br /><a href="https://github.com/kendallgassner/accessibility-alt-text-bot/commits?author=khiga8" title="Code">💻</a> <a href="#a11y-khiga8" title="Accessibility">️️️️♿️</a> <a href="https://github.com/kendallgassner/accessibility-alt-text-bot/commits?author=khiga8" title="Documentation">📖</a> <a href="#infra-khiga8" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/HonkingGoose"><img src="https://avatars.githubusercontent.com/u/34918129?v=4?s=100" width="100px;" alt="HonkingGoose"/><br /><sub><b>HonkingGoose</b></sub></a><br /><a href="https://github.com/kendallgassner/accessibility-alt-text-bot/commits?author=HonkingGoose" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/JoshuaKGoldberg"><img src="https://avatars.githubusercontent.com/u/3335181?v=4?s=100" width="100px;" alt="JoshuaKGoldberg"/><br /><sub><b>JoshuaKGoldberg</b></sub></a><br /><a href="https://github.com/kendallgassner/accessibility-alt-text-bot/commits?author=JoshuaKGoldberg" title="Code">💻</a></td>
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