Adds Microsoft.Csharp to default loaded assembly references.

Author: ENDAVA\mzorec

src/FlubuCore/Scripting/ScriptLoader.cs

@@ -414,6 +414,7 @@ internal static List<AssemblyInfo> GetDefaultReferences()
             assemblyReferenceLocations.AddReferenceByAssemblyName("System.Xml.XPath");
             assemblyReferenceLocations.AddReferenceByAssemblyName("System.Xml.Serialization");
             assemblyReferenceLocations.AddReferenceByAssemblyName("System.Data.Common");
+            assemblyReferenceLocations.AddReferenceByAssemblyName("Microsoft.CSharp");
 #if NETSTANDARD2_0
             var systemAss = typeof(Console).GetTypeInfo().Assembly;
             assemblyReferenceLocations.Add(systemAss.ToAssemblyInfo());