v0.2.0-0

Fixed

• Fix measure() asynchronous implementation.
• Fix percentiles computation.
• Fix inconsistent benchmark behavior: the samples statistical significance
  shall be done on the same measurement base.

Changed

• Add clear() benchmark clearing primitive.
• Optimize JavaScript runtime environment detection code (constify environment
  variables).
• Add IQR samples outlier detection and removal.
• Add standard deviation to JSON report.
• Add samples: number to run() options specifying the minimum number of
  benchmark samples.
• Add
  options: { before: () => void | Promise<void>; after: () => void | Promise<void> }
  to bench() and baseline() specifying callbacks to run before and after the
  benchmark.
• Add
  { before: () => void | Promise<void>; after: () => void | Promise<void> } to
  group() specifying callbacks to run before and after the group.
• Add iter/s to report.