added v1.5.2 entry to CHANGELOG
added v1.5.2 entry to CHANGELOG

zhenglaizhang/thrust,xiongzhanblake/thrust_src,xiongzhanblake/thrust,andrewcorrigan/thrust-multi-permutation-iterator,xiongzhanblake/thrust,marksantos/thrust,arnabgho/thrust,xiongzhanblake/thrust_src,arnabgho/thrust,jaredhoberock/thrust,thrust/thrust,sarvex/thrust,dachziegel/thrust,jaredhoberock/thrust,mohamed-ali/thrust,andrewcorrigan/thrust-multi-permutation-iterator,sarvex/thrust,jaredhoberock/thrust,GrimDerp/thrust,Ricardo666666/thrust,zhenglaizhang/thrust,marksantos/thrust,zeryx/thrust,raygit/thrust,GrimDerp/thrust,thrust/thrust,sdalton1/thrust,marksantos/thrust,mohamed-ali/thrust,dachziegel/thrust,thrust/thrust,jaredhoberock/thrust,dachziegel/thrust,GrimDerp/thrust,Ricardo666666/thrust,mohamed-ali/thrust,zeryx/thrust,thvasilo/thrust,raygit/thrust,xiongzhanblake/thrust_src,thvasilo/thrust,jaredhoberock/thrust,egaburov/thrust,thrust/thrust,andrewcorrigan/thrust-multi-permutation-iterator,raygit/thrust,zeryx/thrust,xiongzhanblake/thrust,thvasilo/thrust,thrust/thrust,sarvex/thrust,sdalton1/thrust,Ricardo666666/thrust,egaburov/thrust,arnabgho/thrust,sdalton1/thrust,egaburov/thrust,zhenglaizhang/thrust