chore(deps): update dependency react-hot-loader to v4.12.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
react-hot-loader	devDependencies	patch	4.12.6 -> 4.12.8

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Release Notes

gaearon/react-hot-loader

### [`v4.12.8`](https://togithub.com/gaearon/react-hot-loader/blob/master/CHANGELOG.md#​4128httpsgithubcomgaearonreact-hot-loadercomparev4127v4128-2019-07-18) [Compare Source](https://togithub.com/gaearon/react-hot-loader/compare/v4.12.7...v4.12.8) ##### Bug Fixes - script error on IE11 due to lack of Object.entries ([6672b26](https://togithub.com/gaearon/react-hot-loader/commit/6672b26)) ### [`v4.12.7`](https://togithub.com/gaearon/react-hot-loader/blob/master/CHANGELOG.md#​4128httpsgithubcomgaearonreact-hot-loadercomparev4127v4128-2019-07-18) [Compare Source](https://togithub.com/gaearon/react-hot-loader/compare/v4.12.6...v4.12.7) ##### Bug Fixes - script error on IE11 due to lack of Object.entries ([6672b26](https://togithub.com/gaearon/react-hot-loader/commit/6672b26))

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