Update to 2.19
    
    - New upstream release 2.19
      - Remove obsolete and wrong version # from Makefile.PL (CPAN RT#88658)
      - Test if read() will return undef; if so, set an error message and (still)
        return undef
      - Change VERSION => $VERSION in Makefile.PL to
        VERSION_FROM => 'lib/Config/Tiny.pm' (CPAN RT#88670)