Pin Flask-Restful in setup.py.
Pin Flask-Restful in setup.py.

New release broke reqparse.Argument subclassing.

ErinCall/sync-engine,PriviPK/privipk-sync-engine,jobscore/sync-engine,PriviPK/privipk-sync-engine,gale320/sync-engine,wakermahmud/sync-engine,closeio/nylas,Eagles2F/sync-engine,jobscore/sync-engine,nylas/sync-engine,nylas/sync-engine,closeio/nylas,gale320/sync-engine,PriviPK/privipk-sync-engine,wakermahmud/sync-engine,jobscore/sync-engine,nylas/sync-engine,PriviPK/privipk-sync-engine,Eagles2F/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,gale320/sync-engine,ErinCall/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,wakermahmud/sync-engine,wakermahmud/sync-engine,gale320/sync-engine,ErinCall/sync-engine,ErinCall/sync-engine,wakermahmud/sync-engine,closeio/nylas,nylas/sync-engine,PriviPK/privipk-sync-engine,gale320/sync-engine,closeio/nylas