Bump rollup from 0.68.2 to 1.2.2

Bumps [rollup](https://github.com/rollup/rollup) from 0.68.2 to 1.2.2.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollup/rollup/commits)

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

Author: dependabot-support

package-lock.json

@@ -38,7 +38,7 @@
     "react": "^16.8.1",
     "react-dom": "^16.7.0",
     "rimraf": "^2.6.3",
-    "rollup": "^0.68.2",
+    "rollup": "^1.2.2",
     "rollup-plugin-babel": "^3.0.7",
     "rollup-plugin-commonjs": "^9.2.0",
     "rollup-plugin-node-resolve": "^3.4.0",