glg.go
func (g *Glg) SetLevelColor(level LEVEL, color func(string) string) *Glg {
	lev, ok := g.logger.Load(level)
	if ok {
		l := lev.(*logger)
		l.color = color
		g.logger.Store(level, l)
	}

	return g
}
func (g *Glg) SetLevelColor(level LEVEL, color func(string) string) *Glg {
	lev, ok := g.logger.Load(level)
	if ok {
		l := lev.(*logger)
		l.color = color
		g.logger.Store(level, l)
	}

	return g
}
// SetLevelColor sets the color for each level