deps: remove **/node_modules/form-data/README.md

Having multiple files with the same name but different casings causes
problems on lots of OS-s.

Refs: nodejs/node#12624
Refs: nodejs/node#11085
Refs: nodejs/node#11020

PR-URL: nodejs/node#12643
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Timothy Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Alexey Orlenko <eaglexrlnk@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>