func (l Link) HasParam(key string) bool {
	for p := range l.Params {
		if p == key {
			return true
		}
	}
	return false
}
HasParam returns if a Link has a particular parameter or not
package linkheader
import (
	"fmt"
	"strings"
)
type Link struct {
	URL    string
	Rel    string
	Params map[string]string
}