chore(deps-dev): bump standard-version from 4.4.0 to 8.0.1

Bumps [standard-version](https://github.com/conventional-changelog/standard-version) from 4.4.0 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@v4.4.0...v8.0.1)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -49,7 +49,7 @@
     "npm-run-all": "^4.1.3",
     "openzeppelin-test-helpers": "^0.4.3",
     "pify": "^4.0.1",
-    "standard-version": "^4.4.0",
+    "standard-version": "^8.0.1",
     "truffle": "4.1.16"
   },
   "dependencies": {