docs: add github as a contributor (#616)

* docs: update README.md [skip ci]

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

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

.all-contributorsrc

@@ -701,6 +701,15 @@
         "security",
         "code"
       ]
+    },
+    {
+      "login": "github",
+      "name": "GitHub",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/9919?v=4",
+      "profile": "https://github.com/about",
+      "contributions": [
+        "infra"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -597,6 +597,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
     <td align="center"><a href="https://github.com/apps/greenkeeper"><img src="https://avatars3.githubusercontent.com/in/505?v=4" width="100px;" alt=""/><br /><sub><b>greenkeeper[bot]</b></sub></a><br /><a href="#infra-greenkeeper[bot]" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/jaredpalmer/tsdx/commits?author=greenkeeper[bot]" title="Code">💻</a></td>
     <td align="center"><a href="https://github.com/apps/allcontributors"><img src="https://avatars0.githubusercontent.com/in/23186?v=4" width="100px;" alt=""/><br /><sub><b>allcontributors[bot]</b></sub></a><br /><a href="#infra-allcontributors[bot]" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/jaredpalmer/tsdx/commits?author=allcontributors[bot]" title="Documentation">📖</a></td>
     <td align="center"><a href="https://github.com/apps/dependabot"><img src="https://avatars0.githubusercontent.com/in/29110?v=4" width="100px;" alt=""/><br /><sub><b>dependabot[bot]</b></sub></a><br /><a href="#infra-dependabot[bot]" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="#security-dependabot[bot]" title="Security">🛡️</a> <a href="https://github.com/jaredpalmer/tsdx/commits?author=dependabot[bot]" title="Code">💻</a></td>
+    <td align="center"><a href="https://github.com/about"><img src="https://avatars1.githubusercontent.com/u/9919?v=4" width="100px;" alt=""/><br /><sub><b>GitHub</b></sub></a><br /><a href="#infra-github" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td>
   </tr>
 </table>