Updated unittest dependency, bumped version
Updated unittest dependency, bumped version

dpeek/dart-markdown,meflyup/markdown,dart-lang/markdown,srawlins/dart-markdown,dpeek/dart-markdown,meflyup/markdown,devoncarew/markd,tomyeh/markd,dart-lang/markdown,srawlins/dart-markdown,tomyeh/markd,dart-lang/markdown,devoncarew/markd,tomyeh/markd,johnpryan/dart-markdown,srawlins/dart-markdown