v0.48.215-alpha

Added

Fixed

• Preserve per-build :js-options in merged-shadow-config. Previously the
  root project's builds had their :js-options unconditionally replaced with
  {}, which clobbered settings like :js-provider :external and
  :external-index. Now the root project's :js-options are left untouched,
  and submodule builds get :js-package-dirs merged into their existing
  :js-options rather than replacing them.

Changed