Add contributors to readme, bump API (#2333)

Author: addisonschultz

README.md

@@ -119,6 +119,12 @@ GitBook wouldn't be possible without these projects:
 -   [Tailwind CSS](https://tailwindcss.com/)
 -   [Framer Motion](https://www.npmjs.com/package/framer-motion)
 
+## Contributors
+
+<a href="https://github.com/gitbookIO/gitbook/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=gitbookIO/gitbook" />
+</a>
+
 ## Legacy GitBook (Deprecated)
 
 Our previous version of GitBook and it's CLI tool are now deprecated. You can still view the old repository and it's commits on this [branch](https://github.com/GitbookIO/gitbook/tree/legacy).