Clean up README phrasing and ordering slightly
Clean up README phrasing and ordering slightly

liuruxian/libextobjc,jiakai-lian/libextobjc,WPDreamMelody/libextobjc,KBvsMJ/libextobjc,kolyuchiy/libextobjc,bboyesc/libextobjc,sandyway/libextobjc,goodheart/libextobjc,sanojnambiar/libextobjc,sunfei/libextobjc,telly/libextobjc