Update ROADMAP.md

Author: Bart Koelman

ROADMAP.md

@@ -12,19 +12,19 @@ We've completed active development on v4.x, but we'll still fix important bugs o
 
 The need for breaking changes has blocked several efforts in the v4.x release, so now that we're starting work on v5, we're going to catch up.
 
-- Remove Resource Hooks [#1025](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1025)
-- Update to .NET/EFCORE 5 [#1026](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1026)
-- Native many-to-many [#935](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/935)
-- Refactorings [#1027](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1027) [#944](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/944)
-- Instrumentation [#1032](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1032)
-- Support System.Text.Json [#664](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/664) [#999](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/999) [#233](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/233)
-- 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)
-- Nullable reference types [#1029](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1029)
-- Tweak trace logging [#1033](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1033)
+- [x] Remove Resource Hooks [#1025](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1025)
+- [x] Update to .NET/EFCORE 5 [#1026](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1026)
+- [x] Native many-to-many [#935](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/935)
+- [x] Refactorings [#1027](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1027) [#944](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/944)
+- [x] Tweak trace logging [#1033](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1033)
+- [x] Instrumentation [#1032](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1032)
+- [x] Optimized delete to-many [#1030](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1030)
+- [ ] Support System.Text.Json [#664](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/664) [#999](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/999) [#233](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/233)
+- [ ] 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)
+- [ ] Nullable reference types [#1029](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1029)
 
 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.
 
-- Optimized delete to-many [#1030](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1030)
 - Improved paging links [#1010](https://github.com/json-api-dotnet/JsonApiDotNetCore/issues/1010)
 - 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)