Bump multer from 1.3.1 to 1.4.0

[dependabot-preview[bot]]

Bumps multer from 1.3.1 to 1.4.0.

Changelog

*Sourced from [multer's changelog](https://github.com/expressjs/multer/blob/master/CHANGELOG.md).* > ## 1.4.0 - 2018-09-26 > > - Feature: Make Multer errors inherit from MulterError

Commits

- [`a04f293`](https://github.com/expressjs/multer/commit/a04f29376aba2ecf7062ff6a00749a4afb39db78) version: 1.4.0 - [`1a11002`](https://github.com/expressjs/multer/commit/1a1100296ae61c35d20f34008798594b672cbb98) history: 1.4.0 - [`805170c`](https://github.com/expressjs/multer/commit/805170c61530e1f1cafd818c9b63d16a9dd46c36) Make Multer errors inherit from MulterError ([#641](https://github-redirect.dependabot.com/expressjs/multer/issues/641)) - [`2592abe`](https://github.com/expressjs/multer/commit/2592abef661f81b4d586c8fb1b875ceab2db54a5) Merge pull request [#643](https://github-redirect.dependabot.com/expressjs/multer/issues/643) from StefKors/patch-1 - [`f5d5e58`](https://github.com/expressjs/multer/commit/f5d5e5876e674d828601635033e582733629b58e) separation paragraphs - [`55a0a1a`](https://github.com/expressjs/multer/commit/55a0a1a7b9c38ff2c05f5556002b5bcde74f267a) Merge pull request [#644](https://github-redirect.dependabot.com/expressjs/multer/issues/644) from turakvlad/improve-readme - [`7f69f69`](https://github.com/expressjs/multer/commit/7f69f693a8fd133db3d948ca0bd8237ae1df58ad) requested formatting update - [`1289227`](https://github.com/expressjs/multer/commit/1289227416944d0a25e308e69a780be027c08f64) Update README.md - [`f6fe3e1`](https://github.com/expressjs/multer/commit/f6fe3e12a3ae3a86a6caf62b7cc7630c18424e93) Update README.md - [`f15bbfa`](https://github.com/expressjs/multer/commit/f15bbfa668e85d6ed7b430918fd3d97b2fbc55a0) Explanation for beginner programmers - Additional commits viewable in [compare view](https://github.com/expressjs/multer/compare/v1.3.1...v1.4.0)

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Superseded by #85.