remove unnecessary licenses.

LICENSE

@@ -213,46 +213,12 @@ notices and license terms. Your use of the source code for these
 subcomponents is subject to the terms and conditions of the following
 licenses.
 
-BSD 3-Clause (zrender):
-The following files embed [zrender](https://github.com/ecomfe/zrender) BSD 3-Clause:
-    `dist/echarts-en.common.js`,
-    `dist/echarts-en.common.min.js`,
-    `dist/echarts-en.js`,
-    `dist/echarts-en.min.js`,
-    `dist/echarts-en.simple.js`,
-    `dist/echarts-en.simple.min.js`,
-    `dist/echarts.common.js`,
-    `dist/echarts.common.min.js`,
-    `dist/echarts.js`,
-    `dist/echarts.min.js`,
-    `dist/echarts.simple.js`,
-    `dist/echarts.simple.min.js`,
-See `licenses/LICENSE-zrender` for details of the license.
-
 BSD 3-Clause (d3.js):
 The following files embed [d3.js](https://github.com/d3/d3) BSD 3-Clause:
     `src/chart/treemap/treemapLayout.js`,
     `src/chart/tree/layoutHelper.js`,
     `src/chart/graph/forceHelper.js`,
     `src/util/array/nest.js`,
+    `src/util/number.js`,
     `src/scale/Time.js`,
-    `lib/chart/treemap/treemapLayout.js`,
-    `lib/chart/tree/layoutHelper.js`,
-    `lib/chart/graph/forceHelper.js`,
-    `lib/util/array/nest.js`,
-    `lib/scale/Time.js`,
-    `extension-src/dataTool/quantile.js`,
-    `extension/dataTool/quantile.js`,
-    `dist/echarts-en.common.js`,
-    `dist/echarts-en.common.min.js`,
-    `dist/echarts-en.js`,
-    `dist/echarts-en.min.js`,
-    `dist/echarts-en.simple.js`,
-    `dist/echarts-en.simple.min.js`,
-    `dist/echarts.common.js`,
-    `dist/echarts.common.min.js`,
-    `dist/echarts.js`,
-    `dist/echarts.min.js`,
-    `dist/echarts.simple.js`,
-    `dist/echarts.simple.min.js`,
 See `licenses/LICENSE-d3` for details of the license.