Updated unit test packages

- tested in visual studio & resharper test tools

Author: humblelistener

WebService.UnitTests/WebService.UnitTests.csproj

@@ -15,10 +15,10 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0-preview-20170106-08" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0-beta5-build1225" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.0.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.2.0" />
     <PackageReference Include="System.Runtime.Serialization.Primitives" Version="4.3.0" />
-    <PackageReference Include="xunit" Version="2.2.0-beta5-build3474" />
+    <PackageReference Include="xunit" Version="2.2.0" />
   </ItemGroup>
 
 </Project>