add delay before resolve mapobx subplot promises
add delay before resolve mapobx subplot promises

... to workaround a mapbox-gl bug introduced in 1.3.0

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