Unexport an error that is not required

mtglib/internal/telegram/init.go

 	"github.com/9seconds/mtg/v2/essentials"
 )
 
-var ErrNoAddresses = errors.New("no addresses")
+var errNoAddresses = errors.New("no addresses")
 
 type preferIP uint8
 

mtglib/internal/telegram/telegram.go

 
 	var conn essentials.Conn
 
-	err := ErrNoAddresses
+	err := errNoAddresses
 
 	for _, v := range addresses {
 		conn, err = t.dialer.DialContext(ctx, v.network, v.address)