Log Message:
Update p5-Test-File-Contents to 0.20.

Changes from previous:
----------------------
0.20    2011-02-18
      - Now require Perl 5.8.3 or higher. 5.8 has effectively been the
        required Perl all along thanks to the dependency on Digest::MD5.
      - Added encoding option, to make sure that files are read in their
        proper encoding.
      - Significant refactoring; only visible change should be that the
        actualy MD5 checksum will no longer be included in the `file_md5sum`
        failure diagnostics.
      - Renamed `file_md5sum` to `file_md5sum_is`. The old name remains as an
        alias for backwards compatibility.
      - Renamed `file_contents_identical` to `files_eq`. The old name remains
        as an alias for backwards compatibility.
      - Added `file_contents_eq_or_diff()` and `files_eq_or_diff()`.

0.10    2011-02-18
      - Maintainership taken by David E. Wheeler.
      - Removed `examples/simple.pl`, since it wouldn't run anyway.
      - Added prototypes to the test functions.
      - Failure diagnostics now appear after the failure message, rather than
        before.
      - Renamed `file_contents_is` and `file_contents_isnt` to
        `file_contents_eq` and `file_contents_ne`, respectively. The old names
        remain as aliases for backwards compatibility.
      - Reworked default test descriptions to include the names of the files
        being tested.
      - Wordsmithed some of the diagnostic messages.