Upgrade eslint NPM packages

[fastjames]

Description

In order to receive security updates for eslint, upgrade its npm packages (base and add-ons) to their most recent releases.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Manual review steps

1. Step 1
2. Step 2

Manual reviewer: please leave a comment with output from the test if that's the case.

[codeclimate]

Code Climate has analyzed commit 058025a and detected 0 issues on this pull request.

View more on Code Climate.

[fastjames]

I ran yarn eslint locally on this branch and it returned no warnings or errors.