README: fix typesetting of "GitHub"
README: fix typesetting of "GitHub"

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