0.2.0

This release contains more experimental
features, along with additional functionality for prior features.

New Experimental features:

• ASAP Smoothing – A graph smoothing algorithm that
  highlights changes.
• Counter Aggregates – Tools to ease working
  with reset-able counters.
• Largest Triangle Three Buckets – A downsampling
  algorithm that tries to preserve visual similarity.
• Time Bucket Range – A version of time_bucket() that outputs the [start, end) times of the bucket.

In addition, we've updated UddSketch with an
aggregate that merges multiple UddSketchs and various internal improvements.