build: Updating npm dependencies
build: Updating npm dependencies

* mkdirp: 0.5.1 → 0.5.3
  * https://npmjs.com/advisories/1179
* eslint: 6.6.0 → 6.8.0
  * https://npmjs.com/advisories/1179
* svgo: 1.2.2 → 1.3.2
  * https://npmjs.com/advisories/1179

Change-Id: Ie46e0ecad8f7ca193227c57c824e6068e5569f66

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo