Examples on the main Page don't work about dataframe-go HOT 3 CLOSED

package main

import (
	"fmt"
	"context"
	"github.com/rocketlaunchr/dataframe-go"
)

func main() {

	s1 := dataframe.NewSeriesInt64("day", nil, 1, 2, 3, 4, 5, 6, 7, 8)
	s2 := dataframe.NewSeriesFloat64("sales", nil, 50.3, 23.4, 56.2, nil, nil, 84.2, 72, 89)
	df := dataframe.NewDataFrame(s1, s2)

	df.Append(nil, 9, 123.16)
	df.Append(nil, map[string]interface{}{
		"day":   10,
		"sales": nil,
	})
	
	df.Remove(0)

	df.UpdateRow(0, nil, map[string]interface{}{
		"day":   3,
		"sales": 45,
	})

	sks := []dataframe.SortKey{
			{Key: "sales", Desc: true},
			{Key: "day", Desc: true},
		}

	df.Sort(ctx, sks)

	fmt.Print(df.Table())
}