chore: bump rollup from 2.30.0 to 2.31.0

Bumps [rollup](https://github.com/rollup/rollup) from 2.30.0 to 2.31.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.30.0...v2.31.0)

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

package.json

@@ -82,7 +82,7 @@
     "npm-run-all": "4.1.5",
     "nyc": "15.1.0",
     "prettier": "2.1.2",
-    "rollup": "2.30.0",
+    "rollup": "2.31.0",
     "sort-package-json": "1.46.0"
   },
   "publishConfig": {