unikmer v0.16.1

Changelog

• v0.16.1
  • change Header.Number from int64 to uint64
  • unikmer info: fix recounting problem for unsorted kmers but with Number.
• v0.16.0
  • unikmer:
    • binary file format change: fix reading long description, and bump version to 5.0.
    • better binary file parsing performance.