Support more kinds of exception types when tracing exception count in Sentinel Dubbo Adapter

[guonanjun]

Issue Description

Type: bug report

Describe what happened (or what feature you want)

使用sentinel-dubbo-adapter后，为资源设置熔断降级时，根据异常比例降级只支持RpcException，不支持其他RuntimeException。

Describe what you expected to happen

期望支持其他RuntimeException。

[sczyh30]

Thanks for reporting! We'll fix this in 0.2.0.