Update to 0.23. From the changelog:

- Attempt to do the right thing with character strings:
  Encode them in UTF-8, tell vim the file encoding (UTF-8),
  and return a (decoded) character string.
  Thanks to Ricardo Signes for the very helpful report (gh-1).
- The included 'text-vimcolor' script will attempt to load
  Win32::Console::ANSI on windows when printing ANSI to STDOUT
  in an attempt to make the output more useful.
- Add a basic test to ensure the script still operates
- Add 'extra_vim_options' to be able to append options to the defaults
- Use IPC::Open3 for portability instead of doing fork/exec manually.
- Various other fixes to attempt to make this usable on Windows.
  Thanks to Yasuhiro Matsumoto (mattn) for helping to port to Windows (gh-5).
- bin/text-vimcolor: Exit after printing usage when --help is specified
  (previous version continued to wait for STDIN).
  Thanks to Vyacheslav Matyukhin for the pull req (gh-6).
- Try to show any available version information before aborting Makefile.PL
- Minor installation and test fixes for older systems
- Simplify version detection using vim script
- Mark encoding tests as TODO tests for now (still under development)
- Remove extraneous vim statement that caused delays on
  some files.  Thanks to Joe Mullally (jhackworth)
  for finding this and for the vim profiling tips (gh-2).
- Abort Makefile.PL before writing Makefile if minimum vim not found
- Try not to hang the installation if an old vim is found
- Lower Term::ANSIColor requirement to 1.03
  and make bright colors normal if Term::ANSIColor version < 3
- Document that the minimum vim version is 6.
  (It has been that way since 2003.)
- Allow debugging based on TEXT_VIMCOLOR_DEBUG env var
- Attempt to make tests more portable across vim versions
  (addressing rt-75829 and a few sparse smoke reports).
- Reorganize the test suite increasing coverage and number.