chore(package): Update dependency babel-plugin-istanbul to v5.1.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
babel-plugin-istanbul	devDependencies	patch	5.1.2 -> 5.1.3	source

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Release Notes

istanbuljs/babel-plugin-istanbul

### [`v5.1.3`](https://togithub.com/istanbuljs/babel-plugin-istanbul/blob/master/CHANGELOG.md#​513httpsgithubcomistanbuljsbabel-plugin-istanbulcomparev512v513-2019-04-23) [Compare Source](https://togithub.com/istanbuljs/babel-plugin-istanbul/compare/v5.1.2...v5.1.3) ##### Bug Fixes - Revert [#​192](https://togithub.com/istanbuljs/babel-plugin-istanbul/issues/192) ([201a933](https://togithub.com/istanbuljs/babel-plugin-istanbul/commit/201a933)) due to regression detailed at [#​201](https://togithub.com/istanbuljs/babel-plugin-istanbul/issues/201)

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