async-ws 0.4.0

async websocket implementation
Documentation 
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<html>
<head>
    <script type="text/javascript">
        function connect() {
            let input = document.getElementById("input");
            let button = document.getElementById("button");
            button.disabled = true;

            let ws = new WebSocket("ws://localhost:8080");
            ws.onmessage = (event) => console.log("message", event.data);
            ws.onclose = ws.onerror = (event) => {
                console.log("closed", event);
                button.value = "connect";
                button.onclick = connect;
                input.disabled = true;
            }
            ws.onopen = () => {
                console.log("ws opened");
                input.disabled = false;
                button.value="send";
                button.disabled = false;
                button.onclick = function() {
                    ws.send(input.value);
                }
            };
        }
    </script>
</head>
<body>
    <textarea id="input" cols="80" rows="10" disabled >hello</textarea><br />
    <input type="button" id="button" value="connect" onclick="connect()" />
</body>
</html>