chore: bump version to 3.0.1

- Update version in src/Directory.Build.props to 3.0.1
- Add release notes for 3.0.1 with recursive type serialization fixes

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: panesofglass

RELEASE_NOTES.md

@@ -1,3 +1,16 @@
+### FSharp.Data.JsonSchema.NJsonSchema 3.0.1
+
+* Fix recursive type serialization for self-referential types with nullable fields
+* Fix NJsonSchemaTranslator to properly handle Ref("#") in nullable contexts
+
+### FSharp.Data.JsonSchema.Core 3.0.1
+
+* No changes (version bump for consistency)
+
+### FSharp.Data.JsonSchema.OpenApi 3.0.1
+
+* No changes (version bump for consistency)
+
 ### FSharp.Data.JsonSchema.NJsonSchema 3.0.0
 
 * **New Package**: Renamed from FSharp.Data.JsonSchema (this is now the go-forward package name)

src/Directory.Build.props

@@ -1,6 +1,6 @@
 <Project>
   <PropertyGroup>
-    <VersionPrefix>2.1.2</VersionPrefix>
+    <VersionPrefix>3.0.1</VersionPrefix>
     <Version>$(Version)</Version>
     <Owners>Ryan Riley</Owners>
     <Authors>Ryan Riley</Authors>