Update rfc-read to version 1.0.0 / rev 2 via SR 1162580
    
    https://build.opensuse.org/request/show/1162580
    by user jubalh + anag+factory
    - Update to 1.0.0:
      * Change the default cache directory location from ~/.RFCs to ~/.cache/RFCs.
    	  Files are automatically migrated if needed.
      * Respect $XDG_CACHE_HOME: if it’s set and $RFC_DIR is not, use
    	  $XDG_CACHE_HOME/RFCs (#21)
      * Fix the version shown by --version
      * Remove the update command which has been deprecated in v0.2.6
      * Fix most shellcheck warnings in the code
      * Show the default and current cache directories in the help text
      * Document --debug in the manpage
      * Add exit codes in the manpage