v4.0.0

If you are upgrading, please see the upgrade guide.

Changed

• Upgrade abstract-leveldown from ~5.0.0 to ~6.0.1 (#155, #157) (@vweevers)
• Don't serialize boolean or NaN keys, have IDB reject them (#155) (@vweevers)
• Update test of key cannot be an empty Array error (#155) (@vweevers)
• Change iterator.db to reference level-js instance, not IDB (#155) (@vweevers)
• Handle location in constructor, as it was removed from abstract-leveldown (#155) (@vweevers)
• Use level-concat-iterator and testCommon.factory() in custom tests (#155) (@vweevers)
• Invoke abstract tests from single function (#155) (@vweevers)
• Upgrade airtap devDependency from 0.0.7 to ^2.0.0 (2b71337, #161) (@ralphtheninja, @vweevers)
• Upgrade standard devDependency from ^11.0.1 to ^12.0.1 (#153) (@vweevers, @ralphtheninja)
• Replace remark-cli devDependency with hallmark (#151, #153) (@vweevers)

Added

• Test and document native sort order (#157) (@vweevers)
• Add iPhone and Android latest to test matrix (#162) (@vweevers)
• Add nyc and coveralls devDependencies (#150, #153) (eb1aead) (@ralphtheninja, @vweevers)
• Add Contributing section to README (c94a9a4) (@ralphtheninja)

Removed

• Remove now irrelevant serialization of nullish values (#155) (@vweevers)
• Remove unused IndexedDBShim from tests (#162) (@vweevers)