Bump helmet from 3.12.1 to 3.13.0

[dependabot-preview[bot]]

Bumps helmet from 3.12.1 to 3.13.0.

Changelog

*Sourced from [helmet's changelog](https://github.com/helmetjs/helmet/blob/master/HISTORY.md).* > 3.13.0 / 2018-07-22 > =================== > > - new: `permittedCrossDomainPolicies` middleware > > 3.12.2 / 2018-07-20 > =================== > > - fix: remove `lodash.reduce` dependency from `csp`

Commits

- [`d75a4a3`](https://github.com/helmetjs/helmet/commit/d75a4a34002bcd66d06723b175c50105fd4e4e11) 3.13.0 - [`56fbf16`](https://github.com/helmetjs/helmet/commit/56fbf16c791576d1b459a19bfaae5b233bbeac5a) Update changelog for 3.13.0 release - [`5d0a9ef`](https://github.com/helmetjs/helmet/commit/5d0a9ef536e2c66a5b25d9e045aa07232ba604ac) Travis should test on Node 10 instead of Node 8 - [`46a2071`](https://github.com/helmetjs/helmet/commit/46a2071a781ef068a5a05aeee09bcab248ca76a7) var → const in README - [`4bc6077`](https://github.com/helmetjs/helmet/commit/4bc60777cda07dde4a5b07b6f0a023686cca8afa) Remove Standard badge from readme - [`fb77bd8`](https://github.com/helmetjs/helmet/commit/fb77bd8efbade7c7962f7d55113ffaf57a610f91) security.md -> SECURITY.md - [`80409f7`](https://github.com/helmetjs/helmet/commit/80409f7401a6d13d1868cf5d44ec5e10af94a68c) Use const instead of var in tests - [`fd4931e`](https://github.com/helmetjs/helmet/commit/fd4931ef893eacfae655e2eaa5e4d134dd0a135a) Add helmet.permittedCrossDomainPolicies middleware - [`f89953a`](https://github.com/helmetjs/helmet/commit/f89953a5ed2e167d82d07ea9cb819cbc3868cb86) Revert "Travis should test on Node 0.10 because we still technically support it" - [`3ce2198`](https://github.com/helmetjs/helmet/commit/3ce21985c7be885043f04af3bb2a82e547db7900) Travis should test on Node 0.10 because we still technically support it - Additional commits viewable in [compare view](https://github.com/helmetjs/helmet/compare/v3.12.1...v3.13.0)

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[dependabot-preview[bot]]

Superseded by #54.