Issue get pyramid with metacello on the release version

[SullyMLT]

Issue get pyramid with metacello on the release version

When we try to get the release version of pyramid, an error show "revspec 'dev-1.0' not found".

Pharo version : 12.0 | 64bits (stable)

Screenshot of the issue :

[Nyan11]

Cannot load the alpha8 using the Readme script