Post-release version bump to 1.20.1
Post-release version bump to 1.20.1

jigpu/clutter,GNOME/clutter,djdeath/clutter,djdeath/clutter,ebassi/clutter,Distrotech/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,Distrotech/clutter,ebassi/clutter,djdeath/clutter,ebassi/clutter,djdeath/clutter,GNOME/clutter,GNOME/clutter,jigpu/clutter,Distrotech/clutter,djdeath/clutter,Distrotech/clutter,djdeath/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,ebassi/clutter,GNOME/clutter,ebassi/clutter