We use arrow functions in most places; this enforces it.
Passing arrow functions to Mocha is discouraged: https://mochajs.org/#arrow-functions
This was a mix of autofixes and hand adjustments.
This resolves the following error occurring in production:
```
TypeError: Cannot read property 'slice' of null
/home/m/shields/lib/suggest.js in twitterPage at line 63:31
const schema = url.protocol.slice(0, -1);
```
This resolves the following error occurring in production:
```
TypeError: Cannot read property 'slice' of null
/home/m/shields/lib/suggest.js in findSuggestions at line 40:33
const userRepo = url.pathname.slice(1).split('/');
```
- Support single-server testing and a local dev server (like Next) that is on a different port from the shields server
- Refactor config schema
With this change, the suggestions work locally in #1273.
Because I despise nitpicking stuff like indentation and spacing in pull request comments, I'd like to nudge forward our automated style checking, at least for new files being added.
I don't want to totally rewrite server.js just to get automated style checking… the blame tracking is just too useful. So let's it's just take care of that when we start splitting it out.
More discussion in #948.
