Fix test

Fix test locally by adding missing [NotNull] attribute.

Author: martincostello

src/AspNet.Security.OAuth.QQ/QQAuthenticationHandler.cs

@@ -163,6 +163,6 @@ protected override async Task<OAuthTokenResponse> ExchangeCodeAsync([NotNull] OA
 
         protected override string FormatScope() => FormatScope(Options.Scope);
 
-        protected override string FormatScope(IEnumerable<string> scopes) => string.Join(',', scopes);
+        protected override string FormatScope([NotNull] IEnumerable<string> scopes) => string.Join(',', scopes);
     }
 }