Update qs to the latest version 🚀

[greenkeeper]

The dependency qs was updated from 6.5.1 to 6.6.0.

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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[greenkeeper]

• The dependency qs was updated from 6.5.1 to 6.7.0.

Update to this version instead 🚀

Commits

The new version differs by 18 commits.

• 125e103 v6.7.0
• 7060e79 [Tests] up to node v11.12, v10.15, v8.15, v6.17
• 9ec4149 [Dev Deps] update eslint, @ljharb/eslint-config, covert, tape
• d33a369 [Tests] temporarily allow coverage to fail
• 3c5725e [Tests] fix Buffer tests to work in node < 4.5 and node < 5.10
• d3a52ee [Refactor] utils: isBuffer: small tweak; add tests
• 41c42b8 [Robustness] stringify: cache Object.prototype.hasOwnProperty
• 04a9017 [Tests] always use String(x) over x.toString()
• c9720fe [Fix] utils.merge: avoid a crash with a null target and an array source
• 8297462 [Refactor]: stringify/utils: cache Array.isArray
• 3cd5200 [Refactor] utils: reduce observable [[Get]]s
• 8bcb6a5 [Fix]utils.merge`: avoid a crash with a null target and a truthy non-array source
• b84acba [New] stringily/parse: add comma as an arrayFormat option
• f22e507 [Refactor] use cached Array.isArray
• dc78092 [Refactor] parse/stringify: make a function to normalize the options

There are 18 commits in total.

See the full diff