Update README: rearrange text
Update README: rearrange text

atlarge-research/graphalytics-platforms-graphmat,tudelft-atlarge/graphalytics-platforms-graphmat,tudelft-atlarge/graphalytics-platforms-graphmat,atlarge-research/graphalytics-platforms-graphmat,tudelft-atlarge/graphalytics-platforms-graphmat,atlarge-research/graphalytics-platforms-graphmat