(#4623) - chore(package): update levelup to version 1.3.1
(#4623) - chore(package): update levelup to version 1.3.1

http://greenkeeper.io/

bbenezech/pouchdb,colinskow/pouchdb,nickcolley/pouchdb,mikeymckay/pouchdb,seigel/pouchdb,yaronyg/pouchdb,tyler-johnson/pouchdb,willholley/pouchdb,willholley/pouchdb,shimaore/pouchdb,colinskow/pouchdb,jhs/pouchdb,daleharvey/pouchdb,tyler-johnson/pouchdb,TechnicalPursuit/pouchdb,pouchdb/pouchdb,bbenezech/pouchdb,nickcolley/pouchdb,cdaringe/pouchdb,lukevanhorn/pouchdb,daleharvey/pouchdb,jhs/pouchdb,shimaore/pouchdb,daleharvey/pouchdb,cdaringe/pouchdb,willholley/pouchdb,tyler-johnson/pouchdb,bbenezech/pouchdb,seigel/pouchdb,garrensmith/pouchdb,pouchdb/pouchdb,lukevanhorn/pouchdb,jhs/pouchdb,lukevanhorn/pouchdb,mikeymckay/pouchdb,cdaringe/pouchdb,TechnicalPursuit/pouchdb,shimaore/pouchdb,colinskow/pouchdb,TechnicalPursuit/pouchdb,mikeymckay/pouchdb,nickcolley/pouchdb,pouchdb/pouchdb,seigel/pouchdb,yaronyg/pouchdb,garrensmith/pouchdb,yaronyg/pouchdb,garrensmith/pouchdb