Fix: Use GetSemanticModelAsync instead of TryGetSemanticModel to make…

… available the SemanticModel in Roslyn conventions (#95)

src/Roslyn/Conventional.Roslyn/Conventions/SolutionDiagnosticAnalyzerConventionSpecification.cs

@@ -33,7 +33,8 @@ public IEnumerable<ConventionResult> IsSatisfiedBy(Solution solution)
         private IEnumerable<ConventionResult> IsSatisfiedBy(Document document)
         {
             var node = document.GetSyntaxRootAsync().Result;
-            if (document.TryGetSemanticModel(out var semanticModel))
+            var semanticModel = document.GetSemanticModelAsync().GetAwaiter().GetResult();
+            if (semanticModel is not null)
             {
                 return IsSatisfiedBy(document, node, semanticModel);
             }