fix cake.json version

Author: TGP

build.cake

@@ -1,5 +1,5 @@
 #tool "nuget:?package=GitVersion.CommandLine&version=5.0.1"
-#addin nuget:?package=Cake.Json
+#addin nuget:?package=Cake.Json&version=4.0.0
 #addin nuget:?package=Newtonsoft.Json
 #addin nuget:?package=System.Net.Http&version=4.3.4
 #addin nuget:?package=System.Text.Encodings.Web&version=4.7.1