v3.0.0

Added

• Add node 9 and 10 to Travis (@vweevers, @ralphtheninja)

Changed

• Upgrade abstract-leveldown to 5.0.0 (@ralphtheninja)
• Upgrade standard to 11.0.0 (@ralphtheninja)
• Tweak readme (@ralphtheninja)
• Use airtap instead of zuul (@vweevers)
• Switch to plain MIT license (@vweevers)

Removed

• Remove TypeScript typings (@ralphtheninja)
• Remove TypeScript tests (@vweevers)
• Remove node 4 from Travis (@ralphtheninja)
• Remove deprecated JWT addon from Travis (@vweevers)
• Remove obsolete --stderr flag (@vweevers)