Update yeoman-test requirement from ^1.7.0 to ^2.0.0

Updates the requirements on [yeoman-test](https://github.com/yeoman/yeoman-test) to permit the latest version.
- [Release notes](https://github.com/yeoman/yeoman-test/releases)
- [Commits](yeoman/yeoman-test@v1.7.0...v2.0.0)

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

Author: dependabot-preview[bot]

package.json

@@ -20,7 +20,7 @@
     "webpack"
   ],
   "devDependencies": {
-    "yeoman-test": "^1.7.0",
+    "yeoman-test": "^2.0.0",
     "yeoman-assert": "^3.1.0",
     "coveralls": "^3.0.5",
     "eslint": "^6.0.1",