Log Message:
Update to 0.020

Upstream changes:
0.020     2015-01-03 20:32:21Z
          - re-release to fix problematic $VERSION declaration (RT#101239)

0.019     2014-12-18 20:07:02Z
          - fix test to allow for special characters (e.g. MSWin32 file
            separators) in filenames (A. Sinan Unur)

0.018     2014-12-17 18:17:30Z
          - fix test to not depend on message formatting changes in newer Carp

0.017     2014-12-16 20:17:22Z
          - handle other warning handlers passing us partial warning messages
            by re-adding the source file and line number