Releasing sabredav 2.0.6
Releasing 1.8.11
vobject 2.1.6
Merge branch '1.8' into 2.0

Conflicts:
	ChangeLog
Fixed vobject version dependency.
Merge branch '2.0' into 2.1

Conflicts:
	ChangeLog.md
Updated changelog.
Releasing 2.1.2