Update to 1.5106
    
    - New upstream release 1.5106
      - Add standard tests
      - Detect mailboxes that contain a mix of newline types; complain about it,
        but also allow the force option to continue processing
      - Avoid OO interface to File::Temp, which in some versions and on some
        operating systems, deletes the file when it is closed (CPAN RT#103835)
      - Fix compatibility issue with newer versions of perl, which remove "." from
        @INC (CPAN RT#121466)
    - Simplify find command using -delete