Update dependency nyc to v13

[renovate]

This Pull Request updates devDependency nyc (source) from v12.0.2 to v13.0.1

Release Notes

v13.0.1

Compare Source

Bug Fixes

• add flag to allow control of intrumenter esModules option, default to looser parsing (#​863) (6b6cd5e)
• Enable es-modules by default. (#​889) (d0b76e2), closes #​796
• Update caching-transform options. (#​873) (52b69ef)
• use uuid/v4 to generate unique identifiers. (#​883) (7483ed9)

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v13.0.0

Compare Source

Bug Fixes

• source was being instrumented twice, due to upstream fix in ista… (#​853) (d0f654c)

Features

• allow rows with 100% statement, branch, and function coverage to be skipped in text report (#​859) (893345a)

BREAKING CHANGES

• --hook-run-in-context, and --hook-run-in-this-context are no longer true by default (they should be enabled if you're using a library like requirejs).

12.0.2 (2018-06-03)

Bug Fixes

• don't bundle istanbul-lib-instrument due to Node 6 issues (b4c325b)
• stop bundling istanbul-lib-instrument due to npm issue on Node 6 (#​854) (ddc9331)

12.0.1 (2018-05-31)

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This PR has been generated by Renovate Bot.

[coveralls]

Pull Request Test Coverage Report for Build 307

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 304:	0.0%
Covered Lines:	14
Relevant Lines:	14

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💛 - Coveralls