Add legacy nodes supported by stick to readme.md

Author: brefra

README.md

@@ -50,6 +50,11 @@ Module providing interfacing with the Plugwise devices:
 - [x] Anna
 - [x] Smile P1
 - [x] Stick
+  - [x] Circle+ / Stealth+
+  - [x] Circle / Stealth
+  - [x] Scan
+  - [ ] Sense (untested)
+  - [ ] Switch
 - [x] Stretch
 - [x] [Home-Assistant](https://home-assistant.io) via
   - [x] Native supporting networked Plugwise products