Example data set is scExOrg instead of scEx

Created by: aghr

In the current version of the main README in section Create sample data set the instructions read:

data("scEx", package = "SCHNAPPs")
save(file = "scEx.Rdata", list = "scEx")

The object loaded with the data() call seems to be scExOrg instead of scEx. If true, then the save() command should read save(file = "scEx.Rdata", list = "scExOrg").