Release v0.9.0-beta19

What's Changed

Support nippy based files in a zip based database - called zippy.
This could be the new goto nippy database format, much more space efficient than "classic" ndnippy:

• 300-400% faster query speeds!
• With just 20-25% larger size than ZIP'ed EDNs
  • for comparison, ndnippy is usually as large as the uncompressed EDNs

Full Changelog: v0.9.0-beta18...v0.9.0-beta19