feat(printWidth): set to 120 columns (#2)

I'm open to debate on this. I'm not super hard sold on this or anything, just thought it'd be good to bring up and get everyone's thoughts on.

prettier.config.js

@@ -8,5 +8,18 @@ module.exports = {
   /* A single quote requires pressing only one key,
    * but a double quote requires holding shift.
    * So, we find single quotes easier to type and prefer them. */
-  singleQuote: true
+  singleQuote: true,
+
+  /* It's true that Prettier warns pretty heavily against setting
+   * this higher than 80 columns: https://prettier.io/docs/en/options.html#print-width
+   *
+   * However, Prettier itself already disregards this warning in
+   * the name of readability: https://prettier.io/docs/en/rationale.html#imports
+   *
+   * Our friend Faulty has been using 120 for some time, and has had no issues.
+   * Indeed, all of Discord seems to use this setting.
+   * 
+   * Lange: having tested this on some of my own real-world code,
+   * I agree with Faulty that it does make things easier to read.
+   printWidth: 120,
 };