docs: add IanGrainger as a contributor (#9)

Author: allcontributors[bot]

.all-contributorsrc

@@ -0,0 +1,24 @@
+{
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "contributors": [
+    {
+      "login": "IanGrainger",
+      "name": "IanGrainger",
+      "avatar_url": "https://avatars0.githubusercontent.com/u/559336?v=4",
+      "profile": "https://github.com/IanGrainger",
+      "contributions": [
+        "code"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "projectName": "jasmine-dom",
+  "projectOwner": "testing-library",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "skipCi": true
+}

README.md

@@ -1,4 +1,7 @@
 <div align="center">
+<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)
+<!-- ALL-CONTRIBUTORS-BADGE:END -->
 <h1>jasmine-dom</h1>
 
 <a href="https://www.joypixels.com/profiles/emoji/sloth/_/5.0">
@@ -963,6 +966,18 @@ For extending Jasmine's matchers outside the realm of DOM testing, [Jasmine-Matc
 ## Contributors
 
 Thanks goes to these people ([emoji key][emojis])
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tr>
+    <td align="center"><a href="https://github.com/IanGrainger"><img src="https://avatars0.githubusercontent.com/u/559336?v=4" width="100px;" alt=""/><br /><sub><b>IanGrainger</b></sub></a><br /><a href="https://github.com/testing-library/jasmine-dom/commits?author=IanGrainger" title="Code">💻</a></td>
+  </tr>
+</table>
+
+<!-- markdownlint-enable -->
+<!-- prettier-ignore-end -->
+<!-- ALL-CONTRIBUTORS-LIST:END -->
 
 <!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
 <!-- prettier-ignore-start -->