docs: fix typo in documentation

Co-authored-by: Seth Bertalotto <seth@bertalotto.net>

README.md

@@ -57,7 +57,7 @@ You will need to register any data services that you wish to use in
 your application.  The interface for your service will be an object
 that must define a `resource` property and at least one
 [CRUD](https://en.wikipedia.org/wiki/Create,_read,_update_and_delete)
-operation.  The `resource` propety will be used when you call one of the
+operation.  The `resource` property will be used when you call one of the
 CRUD operations.
 
 ```js