docs: add marblenix as a contributor (starship#791)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

.all-contributorsrc

@@ -515,7 +515,9 @@
       "avatar_url": "https://avatars0.githubusercontent.com/u/6401427?v=4",
       "profile": "https://marblenix.com",
       "contributions": [
-        "infra"
+        "infra",
+        "code",
+        "test"
       ]
     },
     {

README.md

@@ -294,7 +294,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/pinshan"><img src="https://avatars0.githubusercontent.com/u/7709675?v=4" width="100px;" alt=""/><br /><sub><b>pinshan</b></sub></a><br /><a href="#translation-pinshan" title="Translation">🌍</a></td>
     <td align="center"><a href="https://github.com/brianlow"><img src="https://avatars2.githubusercontent.com/u/938138?v=4" width="100px;" alt=""/><br /><sub><b>Brian Low</b></sub></a><br /><a href="https://github.com/starship/starship/commits?author=brianlow" title="Code">💻</a> <a href="https://github.com/starship/starship/commits?author=brianlow" title="Documentation">📖</a> <a href="https://github.com/starship/starship/commits?author=brianlow" title="Tests">⚠️</a></td>
     <td align="center"><a href="http://matiaskotlik.github.io"><img src="https://avatars2.githubusercontent.com/u/20362627?v=4" width="100px;" alt=""/><br /><sub><b>Matias Kotlik</b></sub></a><br /><a href="https://github.com/starship/starship/commits?author=matiaskotlik" title="Code">💻</a></td>
-    <td align="center"><a href="https://marblenix.com"><img src="https://avatars0.githubusercontent.com/u/6401427?v=4" width="100px;" alt=""/><br /><sub><b>marblenix</b></sub></a><br /><a href="#infra-marblenix" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+    <td align="center"><a href="https://marblenix.com"><img src="https://avatars0.githubusercontent.com/u/6401427?v=4" width="100px;" alt=""/><br /><sub><b>marblenix</b></sub></a><br /><a href="#infra-marblenix" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/starship/starship/commits?author=marblenix" title="Code">💻</a> <a href="https://github.com/starship/starship/commits?author=marblenix" title="Tests">⚠️</a></td>
   </tr>
   <tr>
     <td align="center"><a href="https://github.com/weirongxu"><img src="https://avatars3.githubusercontent.com/u/1709861?v=4" width="100px;" alt=""/><br /><sub><b>Raidou</b></sub></a><br /><a href="https://github.com/starship/starship/commits?author=weirongxu" title="Code">💻</a> <a href="https://github.com/starship/starship/commits?author=weirongxu" title="Tests">⚠️</a></td>