Log for span with exception in traced_function decorator doesn't match the opentracing spec

[condorcet]

Hello!

As I understand this logs are obsolete:
https://github.com/uber-common/opentracing-python-instrumentation/blob/master/opentracing_instrumentation/local_span.py#L166
https://github.com/uber-common/opentracing-python-instrumentation/blob/master/opentracing_instrumentation/local_span.py#L179

... and doesn't match the specification https://github.com/opentracing/specification/blob/master/semantic_conventions.md
There is no payload field and event="error' fits for exceptions better rather than "exception".

Am I right? Should we use standards fields in the decorator?

[yurishkuro]

+1