build: Updating lodash to 4.17.15
build: Updating lodash to 4.17.15

* https://npmjs.com/advisories/1065
* CVE-2019-10744

Change-Id: I29ed53834c2d0d033694374a7d0ec50a2c00e701

wikimedia/mediawiki-extensions-HashTables,wikimedia/mediawiki-extensions-HashTables