Bump rollup from 1.5.0 to 2.79.2

Bumps [rollup](https://github.com/rollup/rollup) from 1.5.0 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@v1.5.0...v2.79.2)

---
updated-dependencies:
- dependency-name: rollup
  dependency-version: 2.79.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -46,7 +46,7 @@
     "mocha": "^6.2.2",
     "mocha-chrome": "^2.2.0",
     "nanomorph": "^5.4.0",
-    "rollup": "^1.4.1",
+    "rollup": "^2.79.2",
     "uglify-js": "^3.7.0",
     "vdom-virtualize": "2.0.0",
     "virtual-dom": "^2.1.1"