Resolution for minimist vulnerability (#19)

Upgrading eslint to resolve vulnerability in minimist@0.2.1 (see
GHSA-vh95-rmgr-6w4m)

@cockroachlabs/eslint-config@0.1.2 /Users/nathanstilwell/Code/ui/packages/eslint-config
└─┬ eslint@6.8.0
  └─┬ mkdirp@0.5.5
    └── minimist@1.2.5