Upgrade pion/rtcp, use nack.Range instead of PacketList.

packetcache/packetcache_test.go

@@ -350,15 +350,14 @@ func TestBitmapPacket(t *testing.T) {
 	}
 
 	p := rtcp.NackPair{first, rtcp.PacketBitmap(bitmap)}
-	pl := p.PacketList()
-
-	for _, s := range pl {
+	p.Range(func (s uint16) bool {
 		if s < 42 || s >= 42+64 {
 			if (value & (1 << (s - 42))) != 0 {
 				t.Errorf("Bit %v unexpectedly set", s-42)
 			}
 		}
-	}
+		return true
+	})
 }
 
 func BenchmarkCachePutGet(b *testing.B) {