update changelog for 1.48.0
update changelog for 1.48.0

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