fix(deps): update dependency istanbul to v0.4.5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
istanbul	dependencies	patch	0.4.4 -> 0.4.5	source

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Release Notes

gotwarlost/istanbul

### [`v0.4.5`](https://renovatebot.com/gh/gotwarlost/istanbul/compare/v0.4.4...v0.4.5) [Compare Source](https://renovatebot.com/gh/gotwarlost/istanbul/compare/v0.4.4...v0.4.5)

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