Typo in README.md
Typo in README.md

bloomberg/bqplot,dmadeka/bqplot,bloomberg/bqplot,rmenegaux/bqplot,ssunkara1/bqplot,ChakriCherukuri/bqplot,ChakriCherukuri/bqplot,SylvainCorlay/bqplot,ssunkara1/bqplot,dmadeka/bqplot,ChakriCherukuri/bqplot,rmenegaux/bqplot,SylvainCorlay/bqplot,SylvainCorlay/bqplot,bloomberg/bqplot