Update the ROADMAP to reflect the new release plan

Author: kvanbere

ROADMAP.md

@@ -1,15 +1,12 @@
 # Roadmap
 
-* Not implemented.
-
-## Upcoming releases
-
-* Not implemented.
+### 1.0.0 (next)
+First non-candidate release. Scheduled for 12th Feb 2018, resolving [these issues](https://github.com/onrock-eng/github-webhooks/milestone/1).
 
 ## Future Release [Backlog]
 
-* Not implemented: links to sorted backlog.
+* [List of outstanding issues with an assigned future release](https://github.com/onrock-eng/github-webhooks/milestones)
 
 ## Old releases
 
-* None.
+* [Alpha candidate `0.9.0` on Hackage](https://hackage.haskell.org/package/github-webhooks-0.9.0/candidate)