Make contributor image wider (nushell#14138)

With this many contributors you otherwise have to scroll really far to
get down to the license info.

The alternative would be to limit the number of faces we show, but it is
cool to have them all (as long as the generated svg doesn't take too
long to load or generate)

README.md

@@ -229,7 +229,7 @@ Please submit an issue or PR to be added to this list.
 See [Contributing](CONTRIBUTING.md) for details. Thanks to all the people who already contributed!
 
 <a href="https://github.com/nushell/nushell/graphs/contributors">
-  <img src="https://contributors-img.web.app/image?repo=nushell/nushell&max=750" />
+  <img src="https://contributors-img.web.app/image?repo=nushell/nushell&max=750&columns=20" />
 </a>
 
 ## License