Update roadmap

docs/roadmap.md

@@ -3,8 +3,12 @@ This roadmap may not always be up to date but gives an idea of what is planned a
 
 ## Implement Overdue/Failed statuses for Stripe recur
 
-For recurring contributions we currently only implement `In Progress`, `Cancelled` and I think `Completed`
-but we need to change that to support `Overdue` and `Failed` status like is implemented and described in GoCardless here: https://docs.civicrm.org/gocardless/en/latest/reference/technical/
+For recurring contributions we currently only implement `In Progress`, `Cancelled` and `Completed`
+but we need to change that to support `Overdue` and `Failed` status like is implemented and described in GoCardless
+here: [https://docs.civicrm.org/gocardless/en/latest/reference/technical/](https://docs.civicrm.org/gocardless/en/latest/reference/technical/)
+
+Details of the Stripe subscription lifecycle can be found here: [https://docs.stripe.com/billing/subscriptions/overview#subscription-lifecycle](https://docs.stripe.com/billing/subscriptions/overview#subscription-lifecycle)
+
 
 ### Estimate: 6 hours.