Fix reference to -parent_span_id in changelog
* A [Kafka sink](https://github.com/stripe/veneur/tree/master/sinks/kafka) has been added for publishing spans or metrics. Thanks, [parabuzzle](https://github.com/parabuzzle) and [gphat](https://github.com/gphat)!
* Buffered trace clients in `github.com/stripe/veneur/trace` now have a new option to automatically flush them in a periodic interval. Thanks, [antifuchs](https://github.com/antifuchs)!
* Gauges can now be marked as `veneurglobalonly` to be globally "last write wins". Thanks [gphat](https://github.com/gphat)!
-* `veneur-emit` now takes `-span_service`, `-trace_id`, `-parent_id`, and `-indicator` arguments. These (combined with `-ssf`) allow submitting spans for tracing when recording timing data for commands. In addition, `-timing` with `-ssf` now works, too.
+* `veneur-emit` now takes `-span_service`, `-trace_id`, `-parent_span_id`, and `-indicator` arguments. These (combined with `-ssf`) allow submitting spans for tracing when recording timing data for commands. In addition, `-timing` with `-ssf` now works, too.
* The `github.com/stripe/veneur/ssf` package now has a few helper functions to create samples that can be attached to spans: `Count`, `Gauge`, `Histogram`, `Timing`. In addition, veneur now has a span sink that extracts these samples and treats them as metrics. Thanks, [antifuchs](https://github.com/antifuchs)
* Spans sent to Lightstep now have an `indicator` tag set, indicating whether the span is an indicator span or not. Thanks, [aditya](https://github.com/chimeracoder)!
* `veneur-emit -command` now streams output from the invoked program's stdout/stderr to its own stdout/stderr. Thanks, [antifuchs](https://github.com/antifuchs)!
