Draft: Resolve "Implement websockets client"

Closes #2

dist/adapter.esm.js

     this.getAuthorizationHeader()
     .then((headers) => {
 
+      const protocols = [];
+      const options = { headers };
+
       const socket = new WebSocket.Client(
         this.config.socket, 
         protocols, 
-        options
+        options,
       );
 
       socket.on('message', function(event) {

dist/adapter.js

     this.getAuthorizationHeader()
     .then((headers) => {
 
+      const protocols = [];
+      const options = { headers };
+
       const socket = new WebSocket.Client(
         this.config.socket, 
         protocols, 
-        options
+        options,
       );
 
       socket.on('message', function(event) {

src/adapter/index.js

     this.getAuthorizationHeader()
     .then((headers) => {
 
+      const protocols = [];
+      const options = { headers };
+
       const socket = new WebSocket.Client(
         this.config.socket, 
         protocols, 
-        options
+        options,
       );
 
       socket.on('message', function(event) {