update avalonia.

Author: Dan Walmsley

src/AvaloniaEdit/AvaloniaEdit.csproj

@@ -11,7 +11,7 @@
   <ItemGroup>
     <PackageReference Include="System.Collections.Immutable" Version="1.3.1" />
     <PackageReference Include="System.Xml.ReaderWriter" Version="4.3.0" />
-    <PackageReference Include="Avalonia" Version="0.5.1-build3552-alpha" />
+    <PackageReference Include="Avalonia" Version="0.5.1-build3595-alpha" />
   </ItemGroup>
 
 </Project>