Update dependency nodemailer to v5.1.1 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
nodemailer (source)	dependencies	patch	5.1.0 -> 5.1.1

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Release Notes

nodemailer/nodemailer

### [`v5.1.1`](https://togithub.com/nodemailer/nodemailer/blob/master/CHANGELOG.md#​511-2019-01-09) [Compare Source](https://togithub.com/nodemailer/nodemailer/compare/v5.1.0...v5.1.1) - Added missing option argument for custom auth

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