bump npm version check to `6.13`
bump npm version check to `6.13`

plotly/plotly.js,plotly/plotly.js,aburato/plotly.js,plotly/plotly.js,aburato/plotly.js,etpinard/plotly.js,etpinard/plotly.js,plotly/plotly.js,etpinard/plotly.js