Update NUnit to 3.5.0

Author: xplicit

src/ServiceStack.OrmLite.PostgreSQL.Tests/ServiceStack.OrmLite.PostgreSQL.Tests.csproj

@@ -65,8 +65,8 @@
     <Reference Include="System.Data.DataSetExtensions" />
     <Reference Include="System.Data" />
     <Reference Include="System.Xml" />
-    <Reference Include="nunit.framework, Version=3.4.1.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnit.3.4.1\lib\net45\nunit.framework.dll</HintPath>
+    <Reference Include="nunit.framework, Version=3.5.0.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
+      <HintPath>..\packages\NUnit.3.5.0\lib\net45\nunit.framework.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="ServiceStack.Text">