No matching version found for @ngrx/core@8.6.0.

[pigeonflight]

When I run the command in the readme to install Grange

npm install @guillotinaweb/grange @guillotinaweb/grange-core @guillotinaweb/grange-form @guillotinaweb/ngx-state-traverser @guillotinaweb/pastanaga-angular @ngrx/core @ngrx/core@8.6.0 @ngrx/effects@8.6.0 angular-svg-icon angular-traversal jexl ngx-schema-form z-schema @angular/cdk date-fns

It fails with the following output

45 verbose argv "/usr/local/Cellar/node/12.10.0/bin/node" "/usr/local/bin/npm" "install" "@guillotinaweb/grange" "@guillotinaweb/grange-core" "@guillotinaweb/grange-form" "@guillotinaweb/ngx-state-traverser" "@guillotinaweb/pastanaga-angular" "@ngrx/core" "@ngrx/core@8.6.0" "@ngrx/effects@8.6.0" "angular-svg-icon" "angular-traversal" "jexl" "ngx-schema-form" "z-schema" "@angular/cdk" "date-fns"
46 verbose node v12.10.0
47 verbose npm  v6.11.3
48 error code ETARGET
49 error notarget No matching version found for @ngrx/core@8.6.0.
50 error notarget In most cases you or one of your dependencies are requesting
50 error notarget a package version that doesn't exist.
51 verbose exit [ 1, true ]

[pigeonflight]

I was able to run the command with
@ngrx/core@1.2.0 instead

npm install @guillotinaweb/grange @guillotinaweb/grange-core @guillotinaweb/grange-form @guillotinaweb/ngx-state-traverser @guillotinaweb/pastanaga-angular @ngrx/core @ngrx/core@1.2.0 @ngrx/effects@8.6.0 angular-svg-icon angular-traversal jexl ngx-schema-form z-schema @angular/cdk date-fns