replace NodeJS buffer with Uint8Array

src/encoders/data/data-packet-chunk.ts

@@ -1,3 +1,7 @@
 import chunk from '../chunk';
-export default (packetHeaderChunk: Buffer, trackerListChunk: Buffer): Buffer =>
-  chunk(0x6755, Buffer.concat([packetHeaderChunk, trackerListChunk]), true);
+export default (packetHeaderChunk: Uint8Array, trackerListChunk: Uint8Array): Uint8Array => {
+  const chunkData = new Uint8Array(packetHeaderChunk.length + trackerListChunk.length);
+  chunkData.set(packetHeaderChunk);
+  chunkData.set(trackerListChunk, packetHeaderChunk.length);
+  return chunk(0x6755, chunkData, true);
+};