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Example with customization #1 is outdated: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)               
              )