Fix size and date of finished downloads
(#5)
Fix memory leak in case of not yet initialized DownloadIntegration
patch => our function in DownloadIntegration.shouldPersistDownload
-> initialization => DownloadIntegration._store.onsaveitem = DownloadIntegration.shouldPersistDownload
-> restore => only DownloadIntegration.shouldPersistDownload restored
(#5)
Update copyright year