Check off roadmap entry

Author: Bart Koelman

ROADMAP.md

@@ -23,11 +23,11 @@ The need for breaking changes has blocked several efforts in the v4.x release, s
 - [x] Optimize IIdentifiable to ResourceObject conversion [#1028](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1028) [#1024](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1024) [#233](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/233)
 - [x] Nullable reference types [#1029](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1029)
 - [x] Improved paging links [#1010](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1010)
+- [x] Configuration validation [#170](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/170)
 
 Aside from the list above, we have interest in the following topics. It's too soon yet to decide whether they'll make it into v5.x or in a later major version.
 
 - Auto-generated controllers [#732](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/732) [#365](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/365)
-- Configuration validation [#170](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/170)
 - Optimistic concurrency [#1004](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1004)
 - Extract annotations into separate package [#730](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/730)
 - OpenAPI (Swagger) [#1046](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1046)