Set the version specifically for ILMerging

If you don't set it specifically, ILMerge will produce a different
version of the IPackage value.

src/Core/Packages/Constants.cs

@@ -75,6 +75,7 @@ public static class Constants
         public static readonly ICollection<string> AssemblyReferencesExtensions
             = new ReadOnlyCollection<string>(new string[] { ".dll", ".exe", ".winmd" });
 
-        public static readonly Version NuGetVersion = typeof(IPackage).Assembly.GetName().Version;
+        // this overcomes ILMerge issues - https://github.com/chocolatey/choco/issues/194
+        public static readonly Version NuGetVersion = new Version(2,8,2,0); // typeof(IPackage).Assembly.GetName().Version;
     }
 }