build(deps-dev): bump rollup from 1.26.2 to 1.26.3

Bumps [rollup](https://github.com/rollup/rollup) from 1.26.2 to 1.26.3.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v1.26.2...v1.26.3)

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

package.json

@@ -36,7 +36,7 @@
     "nyc": "14.1.1",
     "prettier": "1.18.2",
     "rimraf": "3.0.0",
-    "rollup": "1.26.2",
+    "rollup": "1.26.3",
     "rollup-plugin-babel": "4.3.3",
     "rollup-plugin-commonjs": "10.1.0",
     "rollup-plugin-filesize": "6.2.1",