Update python-ExifRead to rev 3 via SR 832672
    
    https://build.opensuse.org/request/show/832672
    by user StevenK + dimstar_suse
    - Update to 2.3.1:
      * Fix bug introduced with v2.3.0 in HEIC processing.
      * Add notice on Python2 EOL
      * Modernize code and improve testing, split up some huge functions
      * Added support for webp file format (#116) by Grzegorz Ruciński
      * Add linting
      * Added missing IFD data type; correct spelling mistake (#119) by Piero
        Toffanin
      * Add syntax highlight for README (#117) by John Lin
      * Add Python 3.8 to CI (#113) by 2*yo
      * make HEIC exif extractor much more compatible (#109) by Tony Guo
      * Add black level tag (#108)
      * Use list instead of tuple for classifiers (#107) by Florian Preinstorfer
      * Add support for Python 3.5, 3.6, 3.7
      * Drop official support for Python 2.6, 3.2, 3.3
      * Fix for string count equals 0 (issue #67)
      * Rebasing of struct pull requests: closes #54