chore(deps-dev): bump standard-version from 6.0.1 to 8.0.1

Bumps [standard-version](https://github.com/conventional-changelog/standard-version) from 6.0.1 to 8.0.1.
- [Release notes](https://github.com/conventional-changelog/standard-version/releases)
- [Changelog](https://github.com/conventional-changelog/standard-version/blob/master/CHANGELOG.md)
- [Commits](conventional-changelog/standard-version@v6.0.1...v8.0.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -59,7 +59,7 @@
     "ng-packagr": "^9.0.0",
     "prettier": "^1.18.2",
     "protractor": "~7.0.0",
-    "standard-version": "^6.0.1",
+    "standard-version": "^8.0.1",
     "ts-node": "~8.3.0",
     "tsickle": "^0.38.1",
     "tslint": "~6.1.0",