v0.10

Added

• Native builds now compile with ZSTD_MULTITHREAD, making
  ZstdCompressParameter.NB_WORKERS (plus JOB_SIZE and OVERLAP_LOG)
  functional instead of a silent no-op. Workers engage above zstd's 512 KiB
  job-size minimum; multithreaded frames are format-valid but not
  byte-identical to single-threaded output. A context that compressed with
  workers holds its native worker threads until close() — reset() does
  not release them, so give such contexts a dedicated owner (never pool
  them). See ADR 0015, which
  supersedes ADR 0014.
  (#80)