upgrade major versions of dependencies

We need this PR https://github.com/brainhubeu/react-carousel/pull/91 to have a passing build. Moreover, nothing can be broken, even if it’s not covered by any test.

In order to contribute, please create a branch in your fork from renovate/major-all-dependencies and open a PR to renovate/major-all-dependencies.

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[piotr-s-brainhub]

@jamsinclair

I reverted your PR and upgraded major versions of dependencies where it was straightforward. So now only a few of them remain, mainly related with react and webpack https://github.com/brainhubeu/react-carousel/pull/190

Package	Type	Update	Change
enzyme (source)	devDependencies	major	^2.9.1 -> ^3.11.0
gatsby	dependencies	major	^1.9.279 -> ^2.19.12
html-webpack-plugin	devDependencies	major	^2.30.1 -> ^3.2.0
react (source)	devDependencies	major	^15.6.2 -> ^16.12.0
react-dom (source)	devDependencies	major	^15.6.2 -> ^16.12.0
react-test-renderer (source)	devDependencies	major	^15.6.2 -> ^16.12.0
sass-loader	devDependencies	major	^7.3.1 -> ^8.0.2
webpack	devDependencies	major	^3.12.0 -> ^4.41.5

[piotr-s-brainhub]

@katiawheeler

No, some major versions are already upgraded, some others are in this PR https://github.com/brainhubeu/react-carousel/pull/226 but the remaining ones need some work to be upgraded.