Bump qs from 6.5.2 to 6.6.0

[dependabot-preview]

Bumps qs from 6.5.2 to 6.6.0.

Changelog

Sourced from qs's changelog.

6.6.0

• [New] Add support for iso-8859-1, utf8 "sentinel" and numeric entities (#268)
• [New] move two-value combine to a utils function (#189)
• [Fix] stringify: fix a crash with strictNullHandling and a custom filter/serializeDate (#279)
• [Fix] when parseArrays is false, properly handle keys ending in [] (#260)
• [Fix] stringify: do not crash in an obscure combo of interpretNumericEntities, a bad custom decoder, & iso-8859-1
• [Fix] utils: merge: fix crash when source is a truthy primitive & no options are provided
• [refactor] stringify: Avoid arr = arr.concat(...), push to the existing instance (#269)
• [Refactor] parse: only need to reassign the var once
• [Refactor] parse/stringify: clean up charset options checking; fix defaults
• [Refactor] add missing defaults
• [Refactor] parse: one less concat call
• [Refactor] utils: compactQueue: make it explicitly side-effecting
• [Dev Deps] update browserify, eslint, @ljharb/eslint-config, iconv-lite, safe-publish-latest, tape
• [Tests] up to node v10.10, v9.11, v8.12, v6.14, v4.9; pin included builds to LTS

Commits

• 34af57e v6.6.0
• 8a8028e [Dev Deps] update browserify, eslint
• 0a2d26f [New] move two-value combine to a utils function
• b853cb8 [refactor] stringify: Avoid arr = arr.concat(...), push to the existing ins...
• 98126ef [Fix] stringify: fix a crash with strictNullHandling and a custom `filter...
• 58d9b3e [Tests] temporarily allow node 0.6 to fail
• ca259b3 [Tests] up to node v11.2, v10.13, v8.13
• 97ad647 [Dev Deps] update eslint
• 0da164d [Fix] utils: merge: fix crash when source is a truthy primitive & no op...
• ac6d4ce [Fix] stringify: do not crash when the following criteria are met:
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #585.