fixing license text error
fixing license text error

as per issue 699 https://github.com/thrust/thrust/issues/699
egaburov/thrust,raygit/thrust,Ricardo666666/thrust,raygit/thrust,egaburov/thrust,raygit/thrust,sarvex/thrust,xiongzhanblake/thrust_src,marksantos/thrust,thvasilo/thrust,sdalton1/thrust,xiongzhanblake/thrust,thvasilo/thrust,egaburov/thrust,sarvex/thrust,sdalton1/thrust,marksantos/thrust,sarvex/thrust,Ricardo666666/thrust,xiongzhanblake/thrust,marksantos/thrust,sdalton1/thrust,xiongzhanblake/thrust,Ricardo666666/thrust,xiongzhanblake/thrust_src,xiongzhanblake/thrust_src,thvasilo/thrust