Update dependency react-hot-loader to v4.12.13

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
react-hot-loader	dependencies	patch	4.12.12 -> 4.12.13

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Release Notes

gaearon/react-hot-loader

### [`v4.12.13`](https://togithub.com/gaearon/react-hot-loader/blob/master/CHANGELOG.md#​41213httpsgithubcomgaearonreact-hot-loadercomparev41212v41213-2019-09-12) [Compare Source](https://togithub.com/gaearon/react-hot-loader/compare/v4.12.12...v4.12.13) ##### Bug Fixes - error overlay should not be injected into the first instance, fixes [#​1337](https://togithub.com/gaearon/react-hot-loader/issues/1337) ([c019663](https://togithub.com/gaearon/react-hot-loader/commit/c019663)) - return null for null types, fixes [#​1324](https://togithub.com/gaearon/react-hot-loader/issues/1324) ([08d7ed1](https://togithub.com/gaearon/react-hot-loader/commit/08d7ed1)) - run hot in batched mode, fixes [#​1332](https://togithub.com/gaearon/react-hot-loader/issues/1332) ([e801daf](https://togithub.com/gaearon/react-hot-loader/commit/e801daf))

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