docs: add lukeingalls as a contributor for doc (testing-library#948)

Author: allcontributors[bot]

.all-contributorsrc

@@ -1663,6 +1663,15 @@
       "contributions": [
         "doc"
       ]
+    },
+    {
+      "login": "lukeingalls",
+      "name": "Luke Ingalls",
+      "avatar_url": "https://avatars.githubusercontent.com/u/45518011?v=4",
+      "profile": "http://lukeingalls.com",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -374,6 +374,7 @@ Thanks goes to these wonderful people
   </tr>
   <tr>
     <td align="center"><a href="https://www.linkedin.com/in/jgsneves/"><img src="https://avatars.githubusercontent.com/u/48700146?v=4?s=100" width="100px;" alt=""/><br /><sub><b>JOAO GABRIEL SANTOS NEVES</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=jgsneves" title="Documentation">📖</a></td>
+    <td align="center"><a href="http://lukeingalls.com"><img src="https://avatars.githubusercontent.com/u/45518011?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Luke Ingalls</b></sub></a><br /><a href="https://github.com/testing-library/testing-library-docs/commits?author=lukeingalls" title="Documentation">📖</a></td>
   </tr>
 </table>