Update level-js to the latest version 🚀

[greenkeeper]

The dependency level-js was updated from 3.0.0 to 4.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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Release Notes for 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)

Commits

The new version differs by 26 commits.

• 830f5b7 4.0.0
• 9983191 Prepare 4.0.0 (#163)
• 5249821 Merge pull request #162 from Level/test-mobile
• 5f309a7 Add iPhone and Android latest to test matrix
• 1235878 Remove unused IndexedDBShim from tests
• f0d68b7 Upgrade airtap devDependency from 0.1.0 to ^2.0.0 (#161)
• 4e1f3ac Merge pull request #157 from Level/fixed-native-order
• 2ee292d test and document native sort order
• dd77275 Revert "temporary workaround for Level/abstract-leveldown#318"
• 73e7b70 upgrade abstract-leveldown from ~6.0.0 to ~6.0.1 (prevent dedupe)
• 0b1507f Merge pull request #155 from Level/abstract-leveldown@6
• 2f97b6e breaking: don't serialize true/false/NaN keys, have IDB reject them
• c94d85a update test of 'key cannot be an empty Array' error
• 2d62675 temporary workaround for Level/abstract-leveldown#318
• bf22f91 remove now irrelevant serialization of nullish values

There are 26 commits in total.

See the full diff

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