* wip * change to minor * Add breaking change explanation * Update docs/content/upgrade-guides/medusa-core/1-9-0.md Co-authored-by: Shahed Nasser <shahednasser@gmail.com> * Update docs/content/upgrade-guides/medusa-core/1-9-0.md Co-authored-by: Shahed Nasser <shahednasser@gmail.com> * Update 1-9-0.md --------- Co-authored-by: Shahed Nasser <shahednasser@gmail.com>