goodhosts.go
func (l HostsLine) IsComment() bool {
	trimLine := strings.TrimSpace(l.Raw)
	isComment := strings.HasPrefix(trimLine, commentChar)
	return isComment
}
func (l HostsLine) IsComment() bool {
	trimLine := strings.TrimSpace(l.Raw)
	isComment := strings.HasPrefix(trimLine, commentChar)
	return isComment
}
// Return ```true``` if the line is a comment.