♻️ update tempy to ^0.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
tempy	dependencies	minor	^0.3.0 -> ^0.4.0

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Release Notes

sindresorhus/tempy

### [`v0.4.0`](https://togithub.com/sindresorhus/tempy/releases/v0.4.0) [Compare Source](https://togithub.com/sindresorhus/tempy/compare/v0.3.0...v0.4.0) ##### Breaking - Require Node.js 10 [`9f815c2`](https://togithub.com/sindresorhus/tempy/commit/9f815c2) ##### Fixes - Fix `tempy.file()` always adds extension-dot `.` even if no extension is given ([#​19](https://togithub.com/sindresorhus/tempy/issues/19)) [`4ecbd80`](https://togithub.com/sindresorhus/tempy/commit/4ecbd80)

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