### Version 5.0.1 ### Steps to reproduce 在使用仪表盘axisLine:{lineStyle:roundCap:true} 属性 ### What is expected? 修复bug支持完善文档中描述的功能 ### What is actually happening? 无法实现文档中描述的 在两端显示成圆形的功能 <!-- This issue is generated by echarts-issue-helper. DO NOT REMOVE --> <!-- This issue is in English. DO NOT REMOVE -->