chore(package): update lerna to version 2.0.0-rc.1
chore(package): update lerna to version 2.0.0-rc.1

https://greenkeeper.io/

rgbkrk/nteract,nteract/composition,captainsafia/nteract,nteract/nteract,nteract/composition,captainsafia/nteract,jdetle/nteract,jdetle/nteract,nteract/nteract,rgbkrk/nteract,jdfreder/nteract,rgbkrk/nteract,jdfreder/nteract,jdfreder/nteract,nteract/composition,captainsafia/nteract,temogen/nteract,rgbkrk/nteract,rgbkrk/nteract,nteract/nteract,temogen/nteract,nteract/nteract,jdetle/nteract,jdetle/nteract,nteract/nteract,captainsafia/nteract,temogen/nteract,jdfreder/nteract