update changelog for 1.49.2
update changelog for 1.49.2

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