lint: explicity set ecma version to 5
lint: explicity set ecma version to 5

aburato/plotly.js,plotly/plotly.js,iongroup/plotly.js,etpinard/plotly.js,iongroup/plotly.js,etpinard/plotly.js,etpinard/plotly.js,asolagmbh/plotly.js,plotly/plotly.js,asolagmbh/plotly.js,asolagmbh/plotly.js,aburato/plotly.js,iongroup/plotly.js,plotly/plotly.js,plotly/plotly.js