Bump qs from 6.5.2 to 6.6.0

[dependabot-preview[bot]]

Bumps qs from 6.5.2 to 6.6.0.

Changelog

*Sourced from [qs's changelog](https://github.com/ljharb/qs/blob/master/CHANGELOG.md).* > ## **6.6.0** > - [New] Add support for iso-8859-1, utf8 "sentinel" and numeric entities ([#268](https://github-redirect.dependabot.com/ljharb/qs/issues/268)) > - [New] move two-value combine to a `utils` function ([#189](https://github-redirect.dependabot.com/ljharb/qs/issues/189)) > - [Fix] `stringify`: fix a crash with `strictNullHandling` and a custom `filter`/`serializeDate` ([#279](https://github-redirect.dependabot.com/ljharb/qs/issues/279)) > - [Fix] when `parseArrays` is false, properly handle keys ending in `[]` ([#260](https://github-redirect.dependabot.com/ljharb/qs/issues/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](https://github-redirect.dependabot.com/ljharb/qs/issues/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`](https://github.com/ljharb/qs/commit/34af57edde61639054ea7b38fdfce050cffdab29) v6.6.0 - [`8a8028e`](https://github.com/ljharb/qs/commit/8a8028ee7723e498fa1066a49753d099c7052de3) [Dev Deps] update `browserify`, `eslint` - [`0a2d26f`](https://github.com/ljharb/qs/commit/0a2d26fe31ade38697c27299ad52885c617bba28) [New] move two-value combine to a `utils` function - [`b853cb8`](https://github.com/ljharb/qs/commit/b853cb86300d0402856fde20ac8f595b81dc430f) [refactor] `stringify`: Avoid arr = arr.concat(...), push to the existing ins... - [`98126ef`](https://github.com/ljharb/qs/commit/98126ef02b76dbdd1905d210c71d39a049809327) [Fix] `stringify`: fix a crash with `strictNullHandling` and a custom `filter... - [`58d9b3e`](https://github.com/ljharb/qs/commit/58d9b3e42fd259db666799f3793621b50a3a5abf) [Tests] temporarily allow node 0.6 to fail - [`ca259b3`](https://github.com/ljharb/qs/commit/ca259b3c353b44ac3710902bbb5b4aaec8c6f7ed) [Tests] up to `node` `v11.2`, `v10.13`, `v8.13` - [`97ad647`](https://github.com/ljharb/qs/commit/97ad64721009555f83d093172199a3c482e3a958) [Dev Deps] update `eslint` - [`0da164d`](https://github.com/ljharb/qs/commit/0da164dea8be8aa41c582a69bcfa54e5bef77a6a) [Fix] `utils`: `merge`: fix crash when `source` is a truthy primitive & no op... - [`ac6d4ce`](https://github.com/ljharb/qs/commit/ac6d4ce2b100528daf5ea9cc4fa13beed025cd94) [Fix] `stringify`: do not crash when the following criteria are met: - Additional commits viewable in [compare view](https://github.com/ljharb/qs/compare/v6.5.2...v6.6.0)

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Superseded by #585.