ini.go
func (c *Config) Delete(section, key string) {
	for sn, sect := range c.sections {
		if sect.name == section {
			for i, opt := range sect.options {
				if opt.name == key {
					c.sections[sn].options = append(sect.options[:i], sect.options[i+1:]...)
					return
				}
			}
			return
		}
	}
}
func (c *Config) Delete(section, key string) {
	for sn, sect := range c.sections {
		if sect.name == section {
			for i, opt := range sect.options {
				if opt.name == key {
					c.sections[sn].options = append(sect.options[:i], sect.options[i+1:]...)
					return
				}
			}
			return
		}
	}
}
// Delete removes the option from the specified section.