docs: add release notes

Author: thomashilzendegen

LICENSE

@@ -1,6 +1,6 @@
 The BSD 3-Clause "New" or "Revised" License
 
-Copyright (c) 2016 - 2022, Thinktecture AG
+Copyright (c) 2016 - 2025, Thinktecture AG
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without

docs/release-notes.md

@@ -2,6 +2,12 @@
 
 Here you can find all the releases of RelayServer 3 with their corresponding change log.
 
+* v3.1.0
+  - Update many external packages (e.g. System.Text.Json having a vulnerability)
+  - Replace IdentityModel.AspNetCore with Duende.AccessTokenManagement
+  - Provide AuthorizationTokenEndpoint directly in discovery document
+  - Deprecate AuthorizationServer in discovery document
+
 * v3.0.1
   - Add NuGet package readme files
 

src/Directory.Build.props

@@ -6,14 +6,14 @@
     <LangVersion>latest</LangVersion>
     <Nullable>enable</Nullable>
 
-    <VersionPrefix>3.0.1</VersionPrefix>
+    <VersionPrefix>3.1.0</VersionPrefix>
     <VersionSuffix></VersionSuffix>
     <Version Condition="'$(BuildNumber)' != ''">$(VersionPrefix)-$(VersionSuffix)-$(BuildNumber)</Version>
 
     <!-- NuGet Package information -->
     <Company>Thinktecture AG</Company>
     <Product>Thinktecture RelayServer</Product>
-    <Copyright>Copyright © $(Company) 2015 - 2024. All rights reserved.</Copyright>
+    <Copyright>Copyright © $(Company) 2015 - 2025. All rights reserved.</Copyright>
     <Authors>Sebastian Gingter;Thomas Hilzendegen</Authors>
     <PackageTags>thinktecture;relayserver</PackageTags>
     <PackageIcon>icon.png</PackageIcon>