v2.0.0

Added

• Add verify-travis-appveyor to tests (@ralphtheninja)
• Add node 9 to Travis and AppVeyor (@ralphtheninja)

Changed

• Upgrade to abstract-leveldown@3.0.0 (@ralphtheninja)
• Tweak badges in README (@vweevers)
• Simplify AppVeyor configuration (@vweevers)
• Upgrade to nan@2.8.0 (@ralphtheninja)
• Upgrade to prebuild@7.0.0 (@ralphtheninja)
• Upgrade to abstract-leveldown@4.0.0 (@ralphtheninja)

Fixed

• Fix destroy on Windows (@vweevers)

Removed

• Remove node 7 from Travis and AppVeyor (@ralphtheninja)