Bump rollup from 1.4.0 to 2.79.2

Bumps [rollup](https://github.com/rollup/rollup) from 1.4.0 to 2.79.2.
- [Release notes](https://github.com/rollup/rollup/releases)
- [Changelog](https://github.com/rollup/rollup/blob/master/CHANGELOG.md)
- [Commits](rollup/rollup@v1.4.0...v2.79.2)

---
updated-dependencies:
- dependency-name: rollup
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package.json

@@ -34,7 +34,7 @@
     "@babel/core": "7.3.4",
     "@babel/preset-env": "7.3.4",
     "@babel/preset-typescript": "7.3.3",
-    "rollup": "1.4.0",
+    "rollup": "2.79.2",
     "rollup-plugin-babel": "4.3.2",
     "rollup-plugin-commonjs": "^9.2.1",
     "rollup-plugin-uglify": "6.0.2",