Fix build

Author: Reavert

VisualStudioDiscordRPC.Shared/Plugs/TextPlugs/VisualStudioVersionTextPlug.cs

@@ -1,13 +1,13 @@
-using EnvDTE;
+using EnvDTE80;
 using VisualStudioDiscordRPC.Shared.Utils;
 
 namespace VisualStudioDiscordRPC.Shared.Plugs.TextPlugs
 {
     public class VisualStudioVersionTextPlug : BaseTextPlug
     {
-        private readonly DTE _dte;
+        private readonly DTE2 _dte;
 
-        public VisualStudioVersionTextPlug(DTE dte) 
+        public VisualStudioVersionTextPlug(DTE2 dte) 
         {
             _dte = dte;
         }

VisualStudioDiscordRPC.Shared/Services/PlugService.cs

@@ -23,9 +23,7 @@ public class PlugService
         private const string VsVersionAssetMapFilename = "vs_assets_map.json";
 
         private readonly List<BasePlug> _plugs = new List<BasePlug>();
-
         private readonly VsObserver _vsObserver = ServiceRepository.Default.GetService<VsObserver>();
-        private readonly VariableService _variableService = ServiceRepository.Default.GetService<VariableService>();
 
         public PlugService()
         {