Update devDependency jimp to ^0.8.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
jimp	devDependencies	patch	^0.8.2 -> ^0.8.3

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Release Notes

oliver-moran/jimp

### [`v0.8.3`](https://togithub.com/oliver-moran/jimp/blob/master/CHANGELOG.md#v083-Wed-Sep-18-2019) [Compare Source](https://togithub.com/oliver-moran/jimp/compare/v0.8.2...v0.8.3) ##### 🐛 Bug Fix - `@jimp/core`, `@jimp/custom`, `jimp` - Fix issues with typings using classes, publish [@​core](https://togithub.com/core) typings, and fix 3.1 typings [#​792](https://togithub.com/oliver-moran/jimp/pull/792) ([@​crutchcorn](https://togithub.com/crutchcorn)) ##### Authors: 1 - Corbin Crutchley ([@​crutchcorn](https://togithub.com/crutchcorn)) * * *

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