chore(deps-dev): bump rollup from 2.18.0 to 2.20.0 (#484)

Bumps [rollup](https://github.com/rollup/rollup) from 2.18.0 to 2.20.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v2.18.0...v2.20.0)

Signed-off-by: dependabot-preview[bot] <[email protected]>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package-lock.json

@@ -97,7 +97,7 @@
     "nyc": "15.1.0",
     "prettier": "2.0.5",
     "pretty-quick": "2.0.1",
-    "rollup": "2.18.0",
+    "rollup": "2.20.0",
     "rollup-plugin-babel": "4.4.0",
     "rollup-plugin-terser": "6.1.0",
     "semantic-release": "17.1.1",