Upgrade some packages without breaking things

[ryanhugh]

I just tried to upgrade all the packages, but a few broke a significant amount of things when I upgraded them:

From yarn outdated:

async 2.6.3 to 3.1.0 https://caolan.github.io/async/

• Upgrading this package causes arrow functions (=>) to be compiled into the output with yarn build which breaks the site in old browsers. The only part of this package we are using is async.retry, so maybe its worth just getting that functionality from somewhere else

cheerio 0.22.0 to 1.0.0-rc.3 https://github.com/cheeriojs/cheerio#readme

• I just don't want to upgrade this one to a release candidate, going to wait until after v1 is officially released.

domutils 1.7.0 to 2.0.0 https://github.com/fb55/domutils#readme

• This one no longer exports anything when you import it with ES6 imports after its upgraded? This is a weird package, needs to be removed from the codebase anyway.

htmlparser2 3.10.1 to 4.0.0 https://github.com/fb55/htmlparser2#readme

• Breaks a newly added unit test for employees.js