leveldown@1.4.6 breaks build 🚨

[greenkeeperio-bot]

Hello 👋

🚨🚨🚨

leveldown just published its new version 1.4.6, which is covered by your current version range. After updating it in your project the build went from success to failure.

This means your software is now malfunctioning, because of this update. Use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 29 commits .

• ef05005 Bumped to 1.4.6
• b152b1b Merge pull request #280 from ralphtheninja/master
• 267586b bump nan to 2.3.0 to remove deprecated calls
• 1ef0452 add node 6 to travis
• ecb8634 Bumped to 1.4.5
• 0c4697f Merge pull request #275 from ralphtheninja/master
• df2b522 steal chjjs script for checking memory consumption
• e8af8c7 Merge pull request #267 from chjj/memleak-fix3
• b86e72b delete calls.
• ce3eb77 optimize iterators by avoiding handles.
• 259a5b7 free start slices on conflicting options.
• ab2d68d dispose of unused slices.
• 160e0b2 release iterator snapshots.
• 1007baf Merge pull request #265 from ralphtheninja/master
• bd95ec1 bump dependencies

There are 29 commits in total. See the full diff.

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