[pitivi] docs: Update the roadmap

[Thibault Saunier <tsaunier src gnome org>]

commit 7992d2b45943fb40fd7f93706f036eae6836c6d7
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Aug 31 20:39:27 2018 +0200

    docs: Update the roadmap

 docs/Roadmap.md | 23 +++++++----------------
 1 file changed, 7 insertions(+), 16 deletions(-)
---
diff --git a/docs/Roadmap.md b/docs/Roadmap.md
index 9a2f9b02..92376264 100644
--- a/docs/Roadmap.md
+++ b/docs/Roadmap.md
@@ -28,22 +28,13 @@ See [Current events](Current_events.md) for past items.
 
 # Major features
 
-## Plugin system
-
--   Status: [done](https://gitlab.gnome.org/GNOME/pitivi/issues/1480),
-    but we still need a [developer
-    console](https://gitlab.gnome.org/GNOME/pitivi/issues/2055), and
-    [documentation with
-    examples](https://gitlab.gnome.org/GNOME/pitivi/issues/2089).
--   **This is very important**. A plugin would have access to the entire
-    app. Being in Python, it will be extremely easy to quickly write
-    useful plugins without having to compile anything. Pitivi plugins
-    will allow manipulating the timeline clips and clip effects
-    automatically, thus allowing great flexibility for custom solutions.
-    See for example [audio
-    normalization](https://gitlab.gnome.org/GNOME/pitivi/issues/638)
-    or the [autoaligner
-    resurrection](https://gitlab.gnome.org/GNOME/pitivi/issues/1345).
+## Porting to Windows and Mac
+
+Status: started
+
+We have a [Homebrew recipe](https://gist.github.com/aleb/8bfe374e4fe68419567a9d473217da95)
+for building Pitivi, but we still have to integrate Matplotlib and
+make a standalone DMG out of that.
 
 ## Motion ramping, time stretching