NBTStream: fixed asymmetrical read/write behaviour with non-compound …

…roots

nobody noticed this because it has never appeared before, but here we are ...

src/NBTStream.php

@@ -149,7 +149,7 @@ public function write($data){
 		$this->offset = 0;
 		$this->buffer = "";
 
-		if($data instanceof CompoundTag){
+		if($data instanceof NamedTag){
 			$this->writeTag($data);
 
 			return $this->buffer;