add vscode extension link and badge | Some internal improvements (not completed yet)

Former-commit-id: 9bc94e90a2780ee81f8188509d98063fb3f2924b

httptest/httptest.go

@@ -87,7 +87,12 @@ func New(t *testing.T, app *iris.Application, setters ...OptionSetter) *httpexpe
 	// set the logger or disable it (default) and disable the updater (for any case).
 	app.Configure(iris.WithoutVersionChecker)
 	app.Logger().SetLevel(conf.LogLevel)
-	app.Build()
+	if err := app.Build(); err != nil {
+		if conf.Debug && (conf.LogLevel == "disable" || conf.LogLevel == "disabled") {
+			app.Logger().Println(err.Error())
+			return nil
+		}
+	}
 
 	testConfiguration := httpexpect.Config{
 		BaseURL: conf.URL,