Update dependency chalk to v2.4.2

This MR contains the following updates:

Package	Type	Update	Change
chalk	devDependencies	patch	2.4.1 -> 2.4.2

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Release Notes

chalk/chalk

v2.4.2

Compare Source

• Strict mode in Flow definition (#​309) https://github.com/chalk/chalk/commit/f95d9ec8c92329fd087fbd3ecb7a87d0e8345b59

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This release is done from the v2-release branch, as master branch targets the work-in-progress v3 release.

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