docs(README): update checkout command
docs(README): update checkout command

beeman/loopback-angular-admin,colmena/colmena,beeman/loopback-angular-admin,beeman/loopback-angular-admin,colmena/colmena-cms,colmena/colmena,colmena/colmena-cms,colmena/colmena-cms,colmena/colmena