Changing the REPL prompt from startup file

I have using REPL in .julia/config/startup.jl, which I have verified is getting executed on startup.
But still doesn’t work. Maybe I’m doing something else wrong.

I’m using Windows with latest binary download (27 days old master).
Maybe this version isn’t recent enough?

               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.7.0-DEV.4690 (2018-03-23 22:25 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit 78c7d87369* (27 days old master)
|__/                   |  x86_64-w64-mingw32

It works now!

Just downloaded Version 0.7.0-DEV.5012 (2018-05-05 21:39 UTC)
Previous version was probably not recent enough.