Update to 0.8.1. Add comment to patch.

Sigil 0.8.1 2014.10.12
- Set minimum OS X version to 10.9.0 in Info.plist so users trying to
  run on older versions of OS X will receive an error dialog instead of
  a crash dialog.
- Set minimum Windows version to Vista in Installer so installation will
  error when trying to install on XP (which is not supported and Sigil
  binary packages won't run on).
- Fix issue #21: Use Hunspell WORDCHARS to help in tokenization of words.
- Pull request #19: Moving plugin description to ToolTips.
- Pull request #20: Preserve current file name for future save as actions
  if appropriate.
- Fix bug where save after using input plugin would fail.

Sigil 0.8.0 2014.09.27
- Plugin framework.
- Add the svg image tag as an svg inline element (not a block element) and
  add it as an empty element (TidyEmptyTags).
- Allow user defined list of entities to preserve.
- Pull request #16: Hardcode menu Plugins in UI, move it before menu Help.
- Pull request #10: Add ability to move entries in TOC up and down.
- Pull request #8: Allow pasting HTML as HTML or plain text in BookView.

(wiz)