Fix AnalysisService using

Author: rjmholt

src/PowerShellEditorServices/Services/Analysis/AnalysisService.cs

@@ -14,6 +14,7 @@
 using Microsoft.PowerShell.EditorServices.Services.Analysis;
 using Microsoft.PowerShell.EditorServices.Services.Configuration;
 using Microsoft.PowerShell.EditorServices.Services.TextDocument;
+using OmniSharp.Extensions.LanguageServer.Protocol;
 using OmniSharp.Extensions.LanguageServer.Protocol.Document;
 using OmniSharp.Extensions.LanguageServer.Protocol.Models;
 using OmniSharp.Extensions.LanguageServer.Protocol.Server;