Added missing tsc output

Author: FlorianRappl

src/ElectronNET.API/Runtime/Services/ElectronProcess/ElectronProcessActive.cs

@@ -7,6 +7,7 @@
     using System.Linq;
     using System.Runtime.InteropServices;
     using System.Text.RegularExpressions;
+    using System.Threading;
     using System.Threading.Tasks;
     using ElectronNET.Common;
     using ElectronNET.Runtime.Data;