chore(deps): update dependency standard-version to v7

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
standard-version	devDependencies	major	6.0.1 -> 7.0.0

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Release Notes

conventional-changelog/standard-version

v7.0.0

Compare Source

⚠ BREAKING CHANGES

• we were accepting .version.json as a config file, rather than .versionrc.json

Bug Fixes

• bump: transmit tag prefix argument to conventionalRecommendedBump (#​393) (8205222)
• cli: display only one, correct default for --preset flag (#​377) (d17fc81)
• commit: don't try to process and add changelog if skipped (#​318) (3e4fdec)
• deps: update dependency conventional-changelog-config-spec to v2 (#​352) (f586844)
• deps: update dependency conventional-recommended-bump to v6 (#​417) (4c5cad1)
• deps: update dependency find-up to v4 (#​355) (73b35f8)
• deps: update dependency find-up to v4.1.0 (#​383) (b621a4a)
• deps: update dependency git-semver-tags to v3 (#​418) (1ce3f4a)
• deps: update dependency semver to v6.3.0 (#​366) (cd866c7)
• deps: update dependency yargs to v13.3.0 (#​401) (3d0e8c7)
• adds support for releaseCommitMessageFormat (#​351) (a7133cc)
• stop suggesting npm publish if package.json was not updated (#​319) (a5ac845)
• Updates package.json to actual supported (tested) NodeJS versions. (#​379) (15eec8a)
• deps: update dependency yargs to v13.2.4 (#​356) (00b2ce6)
• update config file name in command based on README.md (#​357) (ce44dd2)

6.0.1 (2019-05-05)

Bug Fixes

• don't pass args to git rev-parse (1ac72f7)

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