[Snyk] Upgrade leveldown from 5.3.0 to 5.4.0

[snyk-bot]

Snyk has created this PR to upgrade leveldown from 5.3.0 to 5.4.0.

• The recommended version is 1 version ahead of your current version.
• The recommended version was released 9 days ago, on 2019-10-19.

Release notes

• Package name: leveldown
  • 5.4.0 - 2019-10-19

    Changed

    • Refactor initialization of range options (#681) (@vweevers)
    • Make iterator seek target a local variable (#683) (@vweevers)
    • Upgrade node-gyp devDependency from ^5.0.0 to ^6.0.0 (#677) (@vweevers)
    • Upgrade dependency-check devDependency from ^3.3.0 to ^4.1.0 (8965e58) (@vweevers)

    Added

    • Add manifest (Level/community#83) (#685) (@vweevers)
    • Add Cirrus CI for FreeBSD tests ✨ (#678, 55f30a3) (@vweevers)
    • Test that empty range options are ignored (#684) (@vweevers)
  • 5.3.0 - 2019-10-04

    Changed

    • Replace Ubuntu 16.04 with CentOS 7 for prebuilds (#674) (@rvagg). This makes the prebuilt binary for linux compatible with Debian 8, Ubuntu 14.04, RHEL 7, CentOS 7 and other flavors with an old glibc.

    Added

    • Add platform-specific notes (#672, e359e7a) (@vweevers)
from [`leveldown` GitHub Release Notes](https://github.com/Level/leveldown/releases)

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