Bump qs from 6.6.0 to 6.7.0

[dependabot-preview]

Bumps qs from 6.6.0 to 6.7.0.

Changelog

Sourced from qs's changelog.

6.7.0

• [New] stringify/parse: add comma as an arrayFormat option (#276, #219)
• [Fix] correctly parse nested arrays (#212)
• [Fix] utils.merge: avoid a crash with a null target and a truthy non-array source, also with an array source
• [Robustness] stringify: cache Object.prototype.hasOwnProperty
• [Refactor] utils: isBuffer: small tweak; add tests
• [Refactor] use cached Array.isArray
• [Refactor] parse/stringify: make a function to normalize the options
• [Refactor] utils: reduce observable [[Get]]s
• [Refactor] stringify/utils: cache Array.isArray
• [Tests] always use String(x) over x.toString()
• [Tests] fix Buffer tests to work in node < 4.5 and node < 5.10
• [Tests] temporarily allow coverage to fail

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
• Additional commits viewable in compare view

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