minor changes to attributes
minor changes to attributes

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