Update index.html (#899)
原cdn.bootcss.com域名失效，需要切换到新域名cdn.bootcdn.net
官网申明：https://www.bootcdn.cn
diff --git a/dubbo-admin-ui/public/index.html b/dubbo-admin-ui/public/index.html
index 63dadb1..01be2e7 100644
--- a/dubbo-admin-ui/public/index.html
+++ b/dubbo-admin-ui/public/index.html
@@ -23,7 +23,7 @@
<title>Dubbo Admin</title>
<link href='OpenSans.css' rel="stylesheet" type="text/css">
<link rel="shortcut icon" href="dubbo.ico" type="image/x-icon">
- <script src="https://cdn.bootcss.com/echarts/4.0.4/echarts-en.min.js"></script>
+ <script src="https://cdn.bootcdn.net/ajax/libs/echarts/4.0.4/echarts-en.min.js"></script>
</head>
<body>
<div id="app"></div>
