(GH-151) Update nunit to 3.14.0

* fixes #151

Author: devlead

build.cake

@@ -1,5 +1,5 @@
 // Install tools
-#tool nuget:?package=NUnit.ConsoleRunner&version=3.4.0
+#tool nuget:?package=NUnit.ConsoleRunner&version=3.16.3
 
 // Install .NET Core Global tools.
 #tool dotnet:?package=GitVersion.Tool&version=5.12.0

test/LitJSON.Tests.csproj

@@ -7,8 +7,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="nunit" Version="3.9.0" />
-    <PackageReference Include="NUnit3TestAdapter" Version="3.9.0" />
+    <PackageReference Include="nunit" Version="3.14.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
   </ItemGroup>