feat: make css border-radius ootb

CHANGELOG.md

@@ -1,3 +1,7 @@
+## 8.0.0-beta.3
+
+- Made CSS `border-radius` work out-of-the-box.
+
 ## 8.0.0-beta.2
 
 - Added [smart update](https://github.com/ecomfe/vue-echarts/blob/main/README.md#smart-update) strategy to make updates more effortless.

src/style.css

@@ -1 +1,2 @@
 x-vue-echarts{display:block;width:100%;height:100%;min-width:0;}
+x-vue-echarts>:first-child,x-vue-echarts>:first-child>canvas{border-radius:inherit;}