Update README.md

Co-authored-by: Bart Koelman <[email protected]>

README.md

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 # JsonApiDotNetCore
 A framework for building [JSON:API](http://jsonapi.org/) compliant REST APIs using .NET Core and Entity Framework Core. Includes support for the [Atomic Operations](https://jsonapi.org/ext/atomic/) extension.
 
-The ultimate goal of this library is to eliminate as much boilerplate as possible by offering out-of-the-box features such as sorting, filtering and pagination. You just need to focus on defining the resources and implementing your custom business logic. This library has been designed around dependency injection, making extensibility incredibly easy.
+The ultimate goal of this library is to eliminate as much boilerplate as possible by offering out-of-the-box features such as sorting, filtering, pagination, sparse fieldset selection, and side-loading related resources. You just need to focus on defining the resources and implementing your custom business logic. This library has been designed around dependency injection, making extensibility incredibly easy.
 
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