chore(deps-dev): bump rollup from 1.17.0 to 1.18.0

Bumps [rollup](https://github.com/rollup/rollup) from 1.17.0 to 1.18.0.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v1.17.0...v1.18.0)

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

package.json

@@ -66,7 +66,7 @@
     "mocha": "6.2.0",
     "nyc": "14.1.1",
     "prettier": "1.18.2",
-    "rollup": "1.17.0",
+    "rollup": "1.18.0",
     "rollup-plugin-commonjs": "10.0.1",
     "rollup-plugin-node-resolve": "5.2.0",
     "semantic-release": "15.13.19",