Update rollup-plugin-eslint requirement from ^5.1.0 to ^6.0.0

Updates the requirements on [rollup-plugin-eslint](https://github.com/TrySound/rollup-plugin-eslint) to permit the latest version.
- [Release notes](https://github.com/TrySound/rollup-plugin-eslint/releases)
- [Commits](https://github.com/TrySound/rollup-plugin-eslint/compare/v5.1.0...v6.0.0)

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

package.json

@@ -56,7 +56,7 @@
     "rollup": "^1.11.3",
     "rollup-plugin-babel": "^4.3.2",
     "rollup-plugin-commonjs": "^10.0.0",
-    "rollup-plugin-eslint": "^5.1.0",
+    "rollup-plugin-eslint": "^6.0.0",
     "rollup-plugin-json": "^4.0.0",
     "rollup-plugin-node-resolve": "^5.0.0",
     "rollup-plugin-postcss": "^2.0.3",