Updates README for version 2.0.0
Updates README for version 2.0.0

jyushion/AsymmetricGridView,AlexanderMazaletskiy/AsymmetricGridView,jiyuren/AsymmetricGridView,rantianhua/AsymmetricGridView,fjolliver/AsymmetricGridView,shyamkumarm/AsymmetricGridView,changjiashuai/AsymmetricGridView,letanloc/AsymmetricGridView,lichuanzhi7909/AsymmetricGridView,felipecsl/AsymmetricGridView,yulongxiao/AsymmetricGridView,HiWong/AsymmetricGridView,hgl888/AsymmetricGridView,felipecsl/AsymmetricGridView