Configure parse options

Author: sharwell

StyleCop.Analyzers/StyleCop.Analyzers.Test/AnalyzerConfigurationTests.cs

@@ -78,6 +78,9 @@ public CSharpTest(Type analyzerType)
             protected override CompilationOptions CreateCompilationOptions()
                 => new CSharpCompilationOptions(OutputKind.DynamicallyLinkedLibrary, allowUnsafe: true);
 
+            protected override ParseOptions CreateParseOptions()
+                => new CSharpParseOptions(LanguageVersion.CSharp6);
+
             protected override IEnumerable<CodeFixProvider> GetCodeFixProviders()
                 => new CodeFixProvider[0];