docs: fix typo

Author: Jason-Cooke

README.md

@@ -9,7 +9,7 @@
 
 # Development
 
-**Draggable is no longer maintained by its original authors.** Maintence of this repo has been passed on to new collaborators and is no longer worked on by anyone at Shopify.
+**Draggable is no longer maintained by its original authors.** Maintenance of this repo has been passed on to new collaborators and is no longer worked on by anyone at Shopify.
 
 **We are still looking for more maintainers!** If anyone is interested in answering / triaging issues, reviewing / rejecting / approving PRs, and authoring code for bug fixes / new features — please send an email to `curtis.dulmage (at) shopify (dot) com`. You may be asked a few questions before obtaining collaboration permission, but if everything checks out, we will happily add you as a collaborator.