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

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
standard-version	devDependencies	major	^6.0.0 -> ^7.0.0

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Release Notes

conventional-changelog/standard-version

### [`v7.0.0`](https://togithub.com/conventional-changelog/standard-version/blob/master/CHANGELOG.md#​700httpsgithubcomconventional-changelogstandard-versioncomparev601v700-2019-07-30) [Compare Source](https://togithub.com/conventional-changelog/standard-version/compare/v6.0.1...v7.0.0) ##### ⚠ 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](https://togithub.com/conventional-changelog/standard-version/issues/393)) ([8205222](https://togithub.com/conventional-changelog/standard-version/commit/8205222)) - **cli:** display only one, correct default for --preset flag ([#​377](https://togithub.com/conventional-changelog/standard-version/issues/377)) ([d17fc81](https://togithub.com/conventional-changelog/standard-version/commit/d17fc81)) - **commit:** don't try to process and add changelog if skipped ([#​318](https://togithub.com/conventional-changelog/standard-version/issues/318)) ([3e4fdec](https://togithub.com/conventional-changelog/standard-version/commit/3e4fdec)) - **deps:** update dependency conventional-changelog-config-spec to v2 ([#​352](https://togithub.com/conventional-changelog/standard-version/issues/352)) ([f586844](https://togithub.com/conventional-changelog/standard-version/commit/f586844)) - **deps:** update dependency conventional-recommended-bump to v6 ([#​417](https://togithub.com/conventional-changelog/standard-version/issues/417)) ([4c5cad1](https://togithub.com/conventional-changelog/standard-version/commit/4c5cad1)) - **deps:** update dependency find-up to v4 ([#​355](https://togithub.com/conventional-changelog/standard-version/issues/355)) ([73b35f8](https://togithub.com/conventional-changelog/standard-version/commit/73b35f8)) - **deps:** update dependency find-up to v4.1.0 ([#​383](https://togithub.com/conventional-changelog/standard-version/issues/383)) ([b621a4a](https://togithub.com/conventional-changelog/standard-version/commit/b621a4a)) - **deps:** update dependency git-semver-tags to v3 ([#​418](https://togithub.com/conventional-changelog/standard-version/issues/418)) ([1ce3f4a](https://togithub.com/conventional-changelog/standard-version/commit/1ce3f4a)) - **deps:** update dependency semver to v6.3.0 ([#​366](https://togithub.com/conventional-changelog/standard-version/issues/366)) ([cd866c7](https://togithub.com/conventional-changelog/standard-version/commit/cd866c7)) - **deps:** update dependency yargs to v13.3.0 ([#​401](https://togithub.com/conventional-changelog/standard-version/issues/401)) ([3d0e8c7](https://togithub.com/conventional-changelog/standard-version/commit/3d0e8c7)) - adds support for `releaseCommitMessageFormat` ([#​351](https://togithub.com/conventional-changelog/standard-version/issues/351)) ([a7133cc](https://togithub.com/conventional-changelog/standard-version/commit/a7133cc)) - stop suggesting npm publish if package.json was not updated ([#​319](https://togithub.com/conventional-changelog/standard-version/issues/319)) ([a5ac845](https://togithub.com/conventional-changelog/standard-version/commit/a5ac845)) - Updates package.json to _actual_ supported (tested) NodeJS versions. ([#​379](https://togithub.com/conventional-changelog/standard-version/issues/379)) ([15eec8a](https://togithub.com/conventional-changelog/standard-version/commit/15eec8a)) - **deps:** update dependency yargs to v13.2.4 ([#​356](https://togithub.com/conventional-changelog/standard-version/issues/356)) ([00b2ce6](https://togithub.com/conventional-changelog/standard-version/commit/00b2ce6)) - update config file name in command based on README.md ([#​357](https://togithub.com/conventional-changelog/standard-version/issues/357)) ([ce44dd2](https://togithub.com/conventional-changelog/standard-version/commit/ce44dd2)) ##### [6.0.1](https://togithub.com/conventional-changelog/standard-version/compare/v6.0.0...v6.0.1) (2019-05-05) ##### Bug Fixes - don't pass args to git rev-parse ([1ac72f7](https://togithub.com/conventional-changelog/standard-version/commit/1ac72f7))

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