v0.6.3

• Allows rasuvaeff/property-testing-core ^0.7.
• The discard warning is printed before the distribution line, matching the
  Testo adapter; the two emitted the same pair in opposite orders.
• PropertyCheck::clock() — an internal seam, mirroring the Testo adapter, that
  makes the timeoutMs and budgetMs branches testable without real waiting.
• The id() documentation is attached to id() again; it had drifted onto
  currentId(), leaving both methods undocumented.