Update docs.

Build/MQTTnet.nuspec

@@ -19,6 +19,7 @@
 * [Server] Fixed: Sending Large packets with AspnetCore based connection throws System.ArgumentException.
 * [Server] Fixed wrong usage of socket option _NoDelay_.
 * [Server] Added remote certificate validation callback (thanks to @rudacs).
+* [Server] Add support for certificate passwords (thanks to @cslutgen).
 * [MQTTnet.Server] Added REST API for publishing basic messages.
     </releaseNotes>
     <copyright>Copyright Christian Kratky 2016-2019</copyright>

Source/MQTTnet/MQTTnet.csproj

@@ -41,13 +41,13 @@
     <DefineConstants>RELEASE;NETSTANDARD1_3</DefineConstants>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
+  <ItemGroup Condition="'$(TargetFramework)'=='netstandard1.3'">
     <PackageReference Include="System.Net.Security" Version="4.3.2" />
     <PackageReference Include="System.Net.WebSockets" Version="4.3.0" />
     <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.2" />
   </ItemGroup>
 
-  <ItemGroup Condition="'$(TargetFramework)'=='netstandard1.3'">
+  <ItemGroup Condition="'$(TargetFramework)'=='netstandard2.0'">
     <PackageReference Include="System.Net.Security" Version="4.3.2" />
     <PackageReference Include="System.Net.WebSockets" Version="4.3.0" />
     <PackageReference Include="System.Net.WebSockets.Client" Version="4.3.2" />