metacolli and magritte-bootstrap

Hello,

Does anyone know how to install magritte-bootstrap web with metacolli,

I tried this :

Metacello new
     repository: 'github://magritte-metamodel/bootstrap-magritte/source';
     baseline: 'Magritte';
     load.

but I get a message that the baseline could not be found.

Regards,

Roelof