fdo#81523 Bump the requirement for Mac in the Readme to 10.8
fdo#81523 Bump the requirement for Mac in the Readme to 10.8

Change-Id: Ia9868b54824c03ee563973eb71e6ecade3ca589f

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core