Always send the "cameras" experiment in ResourcePackStack (#190)

This prevents crashing on server where they have the experiment enabled.
Fixes #188.

minecraft/conn.go

@@ -976,7 +976,7 @@ func (conn *Conn) handleResourcePackClientResponse(pk *packet.ResourcePackClient
 			return err
 		}
 	case packet.PackResponseAllPacksDownloaded:
-		pk := &packet.ResourcePackStack{BaseGameVersion: protocol.CurrentVersion}
+		pk := &packet.ResourcePackStack{BaseGameVersion: protocol.CurrentVersion, Experiments: []protocol.ExperimentData{{Name: "cameras", Enabled: true}}}
 		for _, pack := range conn.resourcePacks {
 			resourcePack := protocol.StackResourcePack{UUID: pack.UUID(), Version: pack.Version()}
 			// If it has behaviours, add it to the behaviour pack list. If not, we add it to the texture packs