create a mg line plot

        Args:
            df (pandas.DataFrame): data to plot

def create_histogram(df):
    """ create a mg line plot

        Args:
            df (pandas.DataFrame): data to plot
    """
    fig = Figure("/mg/histogram/", "mg_histogram")
    fig.layout.set_size(width=450, height=200)
    fig.layout.set_margin(left=40, right=40)
    fig.graphics.animate_on_load()

    # Make a histogram with 20 bins
    return Histogram(df, fig, "value", 20, init_params={"Data": "Steps"})