docs: add ccamara as a contributor for maintenance (#234)

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

.all-contributorsrc

@@ -389,6 +389,15 @@
         "code",
         "infra"
       ]
+    },
+    {
+      "login": "ccamara",
+      "name": "Carlos Cámara",
+      "avatar_url": "https://avatars.githubusercontent.com/u/706549?v=4",
+      "profile": "http://carloscamara.es/en",
+      "contributions": [
+        "maintenance"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -2,7 +2,7 @@
 
 # A Guide for Contributing to R Core
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-36-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-37-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 This guide is a work in progress, inspired by http://devguide.python.org/. It is deployed at https://contributor.r-project.org/rdevguide/.
@@ -107,6 +107,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     </tr>
     <tr>
       <td align="center" valign="top" width="14.28%"><a href="https://ellakaye.co.uk"><img src="https://avatars.githubusercontent.com/u/7222491?v=4?s=100" width="100px;" alt="Ella Kaye"/><br /><sub><b>Ella Kaye</b></sub></a><br /><a href="https://github.com/r-devel/rdevguide/commits?author=EllaKaye" title="Code">💻</a> <a href="#infra-EllaKaye" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="http://carloscamara.es/en"><img src="https://avatars.githubusercontent.com/u/706549?v=4?s=100" width="100px;" alt="Carlos Cámara"/><br /><sub><b>Carlos Cámara</b></sub></a><br /><a href="#maintenance-ccamara" title="Maintenance">🚧</a></td>
     </tr>
   </tbody>
 </table>