Check Asana #7 (Lucky 7)

- set 'range' to 'plot_info' https://app.asana.com/0/7838292824434/14477880045200/f
- set 'nbinx' and 'nbiny' to 'plot_info' https://app.asana.com/0/7838292824434/14477880045196/f
- update README.md with info about 'type':'plot_info'
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