(#4605) - chore(package): update istanbul to version 0.4.1
(#4605) - chore(package): update istanbul to version 0.4.1

http://greenkeeper.io/

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