Changes

0.3.0

1. Support tracing starting at the browser.
2. Add traceSDKInternal SDK for tracing SDK internal RPC.
3. Add detailMode SDK for tracing http method and url as tags in spans.
4. Fix conditions of http status.

0.2.0

1. Fix: secureConnectionStart is zero bug.
2. Fix: response.status judge bug.

0.1.0

1. Establish the browser exception and tracing core.