Merge pull request #517 from Ovilia/patch-1

Add attribution of Apache marks

Author: 100pah

README.md

@@ -67,3 +67,7 @@ chart.setOption({
 ## License
 
 ECharts-GL is available under the BSD license.
+
+## Notice
+
+The Apache Software Foundation [Apache ECharts, ECharts](https://echarts.apache.org/), Apache, the Apache feather, and the Apache ECharts project logo are either registered trademarks or trademarks of the [Apache Software Foundation](https://www.apache.org/).