Merge PR #359: Update test sdk and nunit packages to the curent versions

Author: Numpsy

test/ICSharpCode.SharpZipLib.TestBootstrapper/ICSharpCode.SharpZipLib.TestBootstrapper.csproj

@@ -8,10 +8,10 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="NUnit" Version="3.7.1" />
+    <PackageReference Include="NUnit" Version="3.12.0" />
     <PackageReference Include="dotnet-test-nunit" Version="3.4.0-beta-3" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.8.0" />
-    <PackageReference Include="NUnitLite" Version="3.7.2" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
+    <PackageReference Include="NUnitLite" Version="3.12.0" />
   </ItemGroup>
 
   <ItemGroup>

test/ICSharpCode.SharpZipLib.Tests/ICSharpCode.SharpZipLib.Tests.csproj

@@ -8,12 +8,12 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.1.1" />
     <PackageReference Include="coveralls.net" Version="0.7.0" />
-    <PackageReference Include="nunit" Version="3.7.1" />
-    <PackageReference Include="nunit.console" Version="3.7.0" />
-    <PackageReference Include="NUnit.Runners" Version="3.7.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.8.0" />
+    <PackageReference Include="nunit" Version="3.12.0" />
+    <PackageReference Include="nunit.console" Version="3.10.0" />
+    <PackageReference Include="NUnit.Runners" Version="3.10.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="3.13.0" />
     <PackageReference Include="OpenCover" Version="4.6.519" />
     <PackageReference Include="PublishCoverity" Version="0.11.0" />
     <PackageReference Include="ReportGenerator" Version="2.5.10" />