func (m MapClaims) VerifyAudience(cmp string, req bool) bool {
	aud, _ := m["aud"].(string)
	return verifyAud(aud, cmp, req)
}
Compares the aud claim against cmp.
If required is false, this method will return true if the value matches or is unset
package jwt
import (
	"encoding/json"
	"errors"
)
type MapClaims map[string]interface{}