Require boto3 in setup.py.
Require boto3 in setup.py.

closeio/nylas,jobscore/sync-engine,nylas/sync-engine,nylas/sync-engine,nylas/sync-engine,closeio/nylas,nylas/sync-engine,closeio/nylas,jobscore/sync-engine,closeio/nylas,jobscore/sync-engine,jobscore/sync-engine