Update example #1 readme

[LSYS]

Example with customization #1 is outdated:

import forestplot as fp

df = fp.load_data("sleep")

fp.forestplot(df, # the dataframe with results data
 estimate="r", # col containing estimated effect size 
 moerror="moerror", # columns containing conf. int. margin of error
 varlabel="label", # column containing variable label
 capitalize="capitalize", # Capitalize labels
 groupvar="group", # Add variable groupings 
 # group ordering
 group_order=["labor factors", "occupation", "age", "health factors", 
 "family factors", "area of residence", "other factors"],
 sort=True, # sort in ascending order (sorts within group if group is specified) 
 )