Add prettier_d to Related Projects (#1328)

`prettier_d` is like [eslint_d], but it runs `prettier` instead of
`eslint`. This eliminates the Node.js startup delay from all but the
first run of `prettier_d`, making it a snappier experience.

[eslint_d]: https://github.com/mantoni/eslint_d.js

Related discussion:
* #575 (comment)
* #918 (comment)
* #753 (comment)

README.md

@@ -410,6 +410,7 @@ passes `prettier` output to `standard --fix`
 - [`prettier-miscellaneous`](https://github.com/arijs/prettier-miscellaneous)
 `prettier` with a few minor extra options
 - [`neutrino-preset-prettier`](https://github.com/SpencerCDixon/neutrino-preset-prettier) allows you to use Prettier as a Neutrino preset
+- [`prettier_d`](https://github.com/josephfrazier/prettier_d.js) runs Prettier as a server to avoid Node.js startup delay
 
 
 ## Technical Details