chore(package): update rollup to version 0.39.0
chore(package): update rollup to version 0.39.0

https://greenkeeper.io/
eventualbuddha/decaffeinate,alangpierce/decaffeinate,eventualbuddha/decaffeinate,decaffeinate/decaffeinate,decaffeinate/decaffeinate,alangpierce/decaffeinate,alangpierce/decaffeinate