[README] Small typo fix
[README] Small typo fix

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