Fix missing release notes in nuget package

Source/MQTTnet/MQTTnet.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
     <Target Name="ImportReleaseNotes" BeforeTargets="GenerateNuspec">
-        <ReadLinesFromFile File="..\workflows\ReleaseNotes.md">
+        <ReadLinesFromFile File="../ReleaseNotes.md">
             <Output TaskParameter="Lines" ItemName="ReleaseNotes"/>
         </ReadLinesFromFile>
         <PropertyGroup>

Source/ReleaseNotes.md

@@ -1,4 +1,21 @@
 **! Read the migration guide (https://github.com/dotnet/MQTTnet/wiki/Upgrading-guide) before migrating to version 5!**
 
 ## Changes
+* Memory usage optimizations (thanks to @mregen)
+* Performance optimizations (thanks to @mregen)
+* Removal of no longer supported .NET Frameworks **(BREAKING CHANGE)**
+* Changed code signing and nuget certificate
+* Namespace changes **(BREAKING CHANGE)**
+* Removal of Managed Client **(BREAKING CHANGE)**
+* Fixed missing release notes in nuget packages.
 
+* Client: MQTT 5.0.0 is now the default version when connecting with a server **(BREAKING CHANGE)**
+* Client: Fixed enhanced authentication.
+* Client: Exposed WebSocket compression options in MQTT client options (thanks to @victornor, #2127)
+* Server: Set default for "MaxPendingMessagesPerClient" to 1000 **(BREAKING CHANGE)**
+* Server: Set SSL version to "None" which will let the OS choose the version **(BREAKING CHANGE)**
+* Server: Fixed enhanced authentication.
+* Server: Set default for "MaxPendingMessagesPerClient" to 1000 **(BREAKING CHANGE)**
+* Server: Set SSL version to "None" which will let the OS choose the version **(BREAKING CHANGE)**
+* Server: Added API for getting a single session (thanks to @AntonSmolkov, #2131)
+* Server: Fixed "TryPrivate" (Mosquitto feature) handling (thanks to @victornor, #2125) **(BREAKING CHANGE)**