Update readme to reflect the new --dev functionality
Update readme to reflect the new --dev functionality

rgbkrk/nteract,nteract/composition,rgbkrk/nteract,nteract/nteract,jdfreder/nteract,rgbkrk/nteract,jdfreder/nteract,jdfreder/nteract,nteract/composition,nteract/composition,jdfreder/nteract,nteract/nteract,rgbkrk/nteract,nteract/nteract,rgbkrk/nteract,nteract/nteract,nteract/nteract