Update dependency nyc to v13.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
nyc	devDependencies	minor	13.0.1 -> 13.1.0	source

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Release Notes

istanbuljs/nyc

v13.1.0

Compare Source

Features

• Bump dependencies. (#​915) (0b3d2cf)
• Rename --temp-directory option to --temp-dir (#​897) (ccf42df)

13.0.1 (2018-07-24)

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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[coveralls]

Coverage remained the same at 98.611% when pulling 29e35d0 on renovate/nyc-13.x into 1d700f0 on master.