Bump beater-helpers from 1.1.0 to 2.0.0

Bumps [beater-helpers](https://github.com/bouzuya/beater-helpers) from 1.1.0 to 2.0.0.
- [Release notes](https://github.com/bouzuya/beater-helpers/releases)
- [Changelog](https://github.com/bouzuya/beater-helpers/blob/master/CHANGELOG.md)
- [Commits](bouzuya/beater-helpers@v1.1.0...v2.0.0)

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

package.json

@@ -34,7 +34,7 @@
     "@typescript-eslint/parser": "^2.17.0",
     "babel-preset-power-assert": "^3.0.0",
     "beater": "^8.0.2",
-    "beater-helpers": "^1.1.0",
+    "beater-helpers": "^2.0.0",
     "coveralls": "^3.0.9",
     "eslint": "^6.8.0",
     "eslint-config-prettier": "^6.9.0",