Update dependency cross-env to v6

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
cross-env	devDependencies	major	^6.0.3	source

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Release Notes

kentcdodds/cross-env

v6.0.3

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Bug Fixes

• do not compile anything (67f21c3)

v6.0.2

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Bug Fixes

• table of contents in README (a825e9c)

v6.0.1

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Bug Fixes

• update all packages, tests, and README (36bb6c3)

v6.0.0

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Bug Fixes

• bumped cross-spawn to version 7.0.0 (#​211) (61ebf59)

BREAKING CHANGES

• Drop support for Node.js < 7.

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