Also build an sdist by default
Also build an sdist by default

so we can use `devpi test` to run tests

grunskis/nuimo-hub-backend,grunskis/nuimo-hub-backend,grunskis/nuimo-hub-backend,grunskis/nuimo-hub-backend,grunskis/senic-hub,grunskis/senic-hub,grunskis/senic-hub,grunskis/senic-hub,grunskis/nuimo-hub-backend,grunskis/senic-hub,getsenic/senic-hub,grunskis/senic-hub,getsenic/senic-hub