BUG: fix vega-embed version in vegalite.v1.html
@@ -4,7 +4,7 @@ HTML_TEMPLATE = """
<head>
<script src="https://cdn.jsdelivr.net/npm/vega@2"></script>
<script src="https://cdn.jsdelivr.net/npm/vega-lite@1"></script>
- <script src="https://cdn.jsdelivr.net/npm/vega-embed@3"></script>
+ <script src="https://cdn.jsdelivr.net/npm/vega-embed@2"></script>
</head>
<body>
<div id="vis"></div>
