Add VoiceReceiver streams

src/client/voice/receiver/VoiceReadable.js

@@ -0,0 +1,20 @@
+const Readable = require('stream').Readable;
+
+class VoiceReadable extends Readable {
+  constructor() {
+    super();
+    this._packets = [];
+    this.open = true;
+  }
+
+  _read() {
+  }
+
+  $push(d) {
+    if (this.open) {
+      this.push(d);
+    }
+  }
+}
+
+module.exports = VoiceReadable;