chore(deps): update dependency c8 to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
c8	devDependencies	major	^4.1.4 -> ^5.0.0	source

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Release Notes

bcoe/c8

### [`v5.0.1`](https://togithub.com/bcoe/c8/blob/master/CHANGELOG.md#​501httpswwwgithubcombcoec8comparev500v501-2019-05-20) [Compare Source](https://togithub.com/bcoe/c8/compare/v5.0.0...v5.0.1) ### [`v5.0.0`](https://togithub.com/bcoe/c8/blob/master/CHANGELOG.md#​500httpswwwgithubcombcoec8comparev415v500-2019-05-20) [Compare Source](https://togithub.com/bcoe/c8/compare/v4.1.5...v5.0.0) ##### ⚠ BREAKING CHANGES - temp directory now defaults to setting for report directory ##### Features - default temp directory to report directory ([#​102](https://www.github.com/bcoe/c8/issues/102)) ([8602f4a](https://www.github.com/bcoe/c8/commit/8602f4a)) - load .nycrc/.nycrc.json to simplify migration ([#​100](https://www.github.com/bcoe/c8/issues/100)) ([bd7484f](https://www.github.com/bcoe/c8/commit/bd7484f)) ##### [4.1.5](https://togithub.com/bcoe/c8/compare/v4.1.4...v4.1.5) (2019-05-11) ##### Bug Fixes - exit with code 1 when report output fails ([#​92](https://togithub.com/bcoe/c8/issues/92)) ([a27b694](https://togithub.com/bcoe/c8/commit/a27b694)) - remove the unmaintained mkdirp dependency ([#​91](https://togithub.com/bcoe/c8/issues/91)) ([a465b65](https://togithub.com/bcoe/c8/commit/a465b65))

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Codecov Report

Merging #21 into master will not change coverage. The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #21   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           1      1           
  Lines          82     82           
=====================================
  Hits           82     82

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