Adds medusa subcribers

packages/medusa-plugin-sendgrid/src/subscribers/order.js

@@ -12,6 +12,10 @@ class OrderSubscriber {
       await this.sendgridService_.transactionalEmail("order.cancelled", order)
     })
 
+    this.eventBus_.subscribe("order.completed", async (order) => {
+      await this.sendgridService_.transactionalEmail("order.completed", order)
+    })
+
     this.eventBus_.subscribe("order.updated", async (order) => {
       await this.sendgridService_.transactionalEmail("order.updated", order)
     })