Roslyn analyzers and code fixes

global.json

@@ -1,5 +1,5 @@
 {
     "sdk": {
-        "version": "2.0.0"
+        "version": "2.1.0"
     }
 }

src/OmniSharp.Roslyn.CSharp/Services/Diagnostics/RoslynAnalyzerService.cs

@@ -99,9 +99,9 @@ private async Task<IEnumerable<DiagnosticLocation>> Analyze(Project project)
             var compiled = await project.GetCompilationAsync();
             var analysis = await compiled
                 .WithAnalyzers(this.providers.SelectMany(x => x.CodeDiagnosticAnalyzerProviders).ToImmutableArray())
-                .GetAnalysisResultAsync(CancellationToken.None);
+                .GetAllDiagnosticsAsync();
 
-            return analysis.GetAllDiagnostics().Select(x => AsDiagnosticLocation(x, project));
+            return analysis.Select(x => AsDiagnosticLocation(x, project));
         }
 
         private static DiagnosticLocation AsDiagnosticLocation(Diagnostic diagnostic, Project project)