Bump nodemailer from 4.6.7 to 4.7.0

[dependabot-preview[bot]]

Bumps nodemailer from 4.6.7 to 4.7.0.

Changelog

*Sourced from [nodemailer's changelog](https://github.com/nodemailer/nodemailer/blob/master/CHANGELOG.md).* > ## 4.7.0 2018-11-19 > > - Cleaned up List-\* header generation > - Fixed 'full' return option for DSN (klaronix) [23b93a3b] > - Support promises `for mailcomposer.build()` > > ## 4.6.8 2018-08-15 > > - Use first IP address from DNS resolution when using a proxy (Limbozz) [d4ca847c] > - Return raw email from SES transport (gabegorelick) [3aa08967]

Commits

- [`533b945`](https://github.com/nodemailer/nodemailer/commit/533b94593f133cf353bca4b2648c1fb8326b7d0e) Merge branch 'master' of github.com:nodemailer/nodemailer - [`a336d86`](https://github.com/nodemailer/nodemailer/commit/a336d86b55d8d2a59958017f38586d4612af48df) v4.7.0 - [`4ed5670`](https://github.com/nodemailer/nodemailer/commit/4ed56702ee459c0299b0a052d1f7c317dd3a710a) Merge pull request [#957](https://github-redirect.dependabot.com/nodemailer/nodemailer/issues/957) from dex4er/cleanup - [`012575f`](https://github.com/nodemailer/nodemailer/commit/012575f76e73e8a4a07dad1f2c23f5cca452c3f1) Clean up old dead code - [`ff4fb72`](https://github.com/nodemailer/nodemailer/commit/ff4fb725f3155023e3b3fa5d3432d321f4e757b0) Merge pull request [#939](https://github-redirect.dependabot.com/nodemailer/nodemailer/issues/939) from amilajack/patch-1 - [`7da4ef4`](https://github.com/nodemailer/nodemailer/commit/7da4ef4fa72e09bb8407f5831f54c316d94e3ff7) Test against latest node - [`2bcff11`](https://github.com/nodemailer/nodemailer/commit/2bcff11684cffc36b6c150fef6e6466308543ce0) Merge pull request [#930](https://github-redirect.dependabot.com/nodemailer/nodemailer/issues/930) from klaronix/master - [`e56a847`](https://github.com/nodemailer/nodemailer/commit/e56a84791da509664f632f44af316fc2247f005e) support promises for mailcomposer.build() - [`23b93a3`](https://github.com/nodemailer/nodemailer/commit/23b93a3ba2cf32edf68914c4275a747e4132997b) Allow 'full' return option for DSN - [`bc2b520`](https://github.com/nodemailer/nodemailer/commit/bc2b52082186fdf8712b8a4737abe88e46061c3e) v4.6.8 - Additional commits viewable in [compare view](https://github.com/nodemailer/nodemailer/compare/v4.6.7...v4.7.0)

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Superseded by #138.