func (w *Writer) SetLevel(level string, effect string) {
	levels := w.Levels()
	levels[level] = effect
	w.SetLevels(levels)
}
func (w *Writer) SetLevel(level string, effect string) {
	levels := w.Levels()
	levels[level] = effect
	w.SetLevels(levels)
}
func ( w * Writer ) SetLevel ( level string , effect string ) { levels := w . Levels ( ) levels [ level ] = effect w . SetLevels ( levels ) }
// SetLevel sets an individual level and its associated display effect.
SetLevel sets an individual level and its associated display effect .