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Added strikethrough syntax to GitHub Flavored Markdown parser #184
GitHub Flavored Markdown supports strikethrough text according to GitHub Help - GitHub Flavored Markdown but the GFM parser included with kramdown doesn't support it.
I've added strikethrough support to the GFM parser: when it encounters text delimited by two or more tildes, it creates a <del> HTML element that contains the text. This doesn't affect the standard kramdown parser.