Bump rollup from 1.32.1 to 2.0.0

Bumps [rollup](https://github.com/rollup/rollup) from 1.32.1 to 2.0.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v1.32.1...v2.0.0)

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

package.json

@@ -21,7 +21,7 @@
     "chai": "^4.1.2",
     "mocha": "^7.0.1",
     "nyc": "^15.0.0",
-    "rollup": "^1.29.1",
+    "rollup": "^2.0.0",
     "rollup-plugin-typescript2": "^0.26.0",
     "typescript": "^3.7.5"
   }