add `secret_key_base` as a workaround
add `secret_key_base` as a workaround

once https://github.com/plataformatec/devise/pull/4869/files is merged,
we can remove this

fixes #24
LaunchAcademy/make_it_so,LaunchAcademy/make_it_so,LaunchAcademy/make_it_so