chore(deps): update commitlint monorepo to v8 (major)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
@​commitlint/cli	devDependencies	major	^8.0.0	source
@​commitlint/config-conventional	devDependencies	major	^8.0.0	source

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Release Notes

conventional-changelog/commitlint

### [`v8.0.0`](https://togithub.com/conventional-changelog/commitlint/blob/master/CHANGELOG.md#​800httpsgithubcomconventional-changelogcommitlintcomparev762v800) [Compare Source](https://togithub.com/conventional-changelog/commitlint/compare/v7.6.1...v8.0.0) ##### Breaking Changes - fix: avoid excessive help text [#​606](https://togithub.com/conventional-changelog/commitlint/issues/606) ([#​637](https://togithub.com/conventional-changelog/commitlint/issues/637)) The commitlint default formatter is now silent for reports without warnings or errors. Scripts relying on the success output of commitlint can restore the former output by specifying the --verbose flag. #### [7.6.2](https://togithub.com/conventional-changelog/commitlint/compare/v7.6.0...v7.6.2) - Republish packages with out of sync artifacts #### [7.6.1](https://togithub.com/conventional-changelog/commitlint/compare/v7.6.0...v7.6.1) (2019-05-09) ##### Bug Fixes - ensure format() is available as commonjs default export [#​645](https://togithub.com/conventional-changelog/commitlint/issues/645) ([ec3da92](https://togithub.com/conventional-changelog/commitlint/commit/ec3da92)) - handle absolute config paths correctly [#​647](https://togithub.com/conventional-changelog/commitlint/issues/647) ([49b3a77](https://togithub.com/conventional-changelog/commitlint/commit/49b3a77)) ### [`v7.6.1`](https://togithub.com/conventional-changelog/commitlint/blob/master/CHANGELOG.md#​761httpsgithubcomconventional-changelogcommitlintcomparev760v761-2019-05-09) [Compare Source](https://togithub.com/conventional-changelog/commitlint/compare/v7.6.0...v7.6.1) ##### Bug Fixes - ensure format() is available as commonjs default export [#​645](https://togithub.com/conventional-changelog/commitlint/issues/645) ([ec3da92](https://togithub.com/conventional-changelog/commitlint/commit/ec3da92)) - handle absolute config paths correctly [#​647](https://togithub.com/conventional-changelog/commitlint/issues/647) ([49b3a77](https://togithub.com/conventional-changelog/commitlint/commit/49b3a77))

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[codecov-io]

Codecov Report

Merging #611 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #611   +/-   ##
=======================================
  Coverage   83.09%   83.09%           
=======================================
  Files          15       15           
  Lines        2058     2058           
  Branches      423      423           
=======================================
  Hits         1710     1710           
  Misses        346      346           
  Partials        2        2

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