README.md: update sync adapter status

We forgot to update the README when we added support for it back in
c6292f83d7

README.md

@@ -20,7 +20,7 @@ The things included in the `Standard` Edition zip are:
  - AuroraServices (From Whyorean's GitLab)
  - Swype libs for AOSP keyboard (From OpenGApps GitHub repo)
  - Some Google DRM jars (From OpenGApps GitHub repo)
- - Google Sync adapters for KK to Q (From OpenGApps GitHub repo)
+ - Google Sync adapters for KK to R (From OpenGApps GitHub repo)
  - Permission files for all of this
  - An addon.d file to backup/restore everything on a rom flash