feat(app): add typescript support for undo prop

.all-contributorsrc

@@ -75,6 +75,16 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "levidurfee",
+      "name": "Levi Durfee",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/10798199?v=4",
+      "profile": "https://levi.lol/",
+      "contributions": [
+        "code",
+        "doc"
+      ]
     }
   ]
 }

README.md

@@ -73,6 +73,7 @@ This project follows the [all-contributors](https://github.com/kentcdodds/all-co
 <!-- prettier-ignore -->
 | [<img src="https://avatars2.githubusercontent.com/u/10157307?v=4" width="100px;"/><br /><sub><b>Will</b></sub>](https://github.com/willb335)<br />[💻](https://github.com/willb335/chessboardjsx/commits?author=willb335 "Code") [📖](https://github.com/willb335/chessboardjsx/commits?author=willb335 "Documentation") [💡](#example-willb335 "Examples") [⚠️](https://github.com/willb335/chessboardjsx/commits?author=willb335 "Tests") | [<img src="https://avatars3.githubusercontent.com/u/146082?v=4" width="100px;"/><br /><sub><b>Andrew Bashelor</b></sub>](https://github.com/a-bash)<br />[📖](https://github.com/willb335/chessboardjsx/commits?author=a-bash "Documentation") | [<img src="https://avatars3.githubusercontent.com/u/25490975?v=4" width="100px;"/><br /><sub><b>yougotgotyo</b></sub>](https://chadburg.com/)<br />[🤔](#ideas-yougotgotyo "Ideas, Planning, & Feedback") | [<img src="https://avatars0.githubusercontent.com/u/385366?v=4" width="100px;"/><br /><sub><b>Roger Knapp</b></sub>](http://csharptest.net)<br />[🤔](#ideas-csharptest "Ideas, Planning, & Feedback") | [<img src="https://avatars1.githubusercontent.com/u/37779?v=4" width="100px;"/><br /><sub><b>Tiago Serafim</b></sub>](https://github.com/slig)<br />[💻](https://github.com/willb335/chessboardjsx/commits?author=slig "Code") [📖](https://github.com/willb335/chessboardjsx/commits?author=slig "Documentation") | [<img src="https://avatars1.githubusercontent.com/u/536006?v=4" width="100px;"/><br /><sub><b>Kef Schecter</b></sub>](http://www.furrykef.com/)<br />[🐛](https://github.com/willb335/chessboardjsx/issues?q=author%3Afurrykef "Bug reports") | [<img src="https://avatars0.githubusercontent.com/u/42919?v=4" width="100px;"/><br /><sub><b>Nils-Helge Garli Hegvik</b></sub>](http://www.lånekalkulatoren.no)<br />[💻](https://github.com/willb335/chessboardjsx/commits?author=nilsga "Code") |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
+| [<img src="https://avatars1.githubusercontent.com/u/10798199?v=4" width="100px;"/><br /><sub><b>Levi Durfee</b></sub>](https://levi.lol/)<br />[💻](https://github.com/willb335/chessboardjsx/commits?author=levidurfee "Code") [📖](https://github.com/willb335/chessboardjsx/commits?author=levidurfee "Documentation") |
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 ## LICENSE