Version 1.0.1 - 10 May 2020  DOI: improved handling if optionally mapped to Identifiers.  New option: automatically resolve the DOI URL for the .ris just added as a 'book' to Calibre, and open it as a new tab in your default browser so that a desired document format (e.g. PDF) may be downloaded if desired.
Version 1.0.0 - 06 May 2020  Initial version of ERC.