Update release notes for the new proxy stage
Update release notes for the new proxy stage

ebassi/clutter,rkudiyarov/clutter_osx,kerrickstaley/clutter-vala,dlespiau/clutter,djdeath/clutter,djdeath/clutter,tardyp/clutter,ebassi/clutter,tardyp/clutter,djdeath/clutter-multithreaded,collects/clutter,nobled/clutter,Distrotech/clutter,kerrickstaley/clutter-vala,spatulasnout/clutter,rkudiyarov/clutter_osx,nobled/clutter,kerrickstaley/clutter-vala,jigpu/clutter,djdeath/clutter,djdeath/clutter,Distrotech/clutter,djdeath/clutter-android,heysion/clutter-clone,djdeath/clutter,djdeath/clutter-android,djdeath/clutter-android,dlespiau/clutter,collects/clutter,Distrotech/clutter,jigpu/clutter,spatulasnout/clutter,jigpu/clutter,spatulasnout/clutter,jigpu/clutter,Distrotech/clutter,GNOME/clutter,djdeath/clutter-android,ebassi/clutter,djdeath/clutter-multithreaded,heysion/clutter-clone,collects/clutter,djdeath/clutter-android,djdeath/clutter,djdeath/clutter-multithreaded,kerrickstaley/clutter-vala,jigpu/clutter,jigpu/clutter,GNOME/clutter,heysion/clutter-clone,djdeath/clutter-multithreaded,spatulasnout/clutter,nobled/clutter,rkudiyarov/clutter_osx,Distrotech/clutter,ebassi/clutter,tardyp/clutter,GNOME/clutter,collects/clutter,heysion/clutter-clone,collects/clutter,heysion/clutter-clone,rkudiyarov/clutter_osx,GNOME/clutter,ebassi/clutter,GNOME/clutter,dlespiau/clutter,Distrotech/clutter,spatulasnout/clutter