Removed outdated build status badges.

Author: phillmv

README.md

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 cmark-gfm
 =========
 
-[![Build Status]](https://travis-ci.org/github/cmark-gfm)
-[![Windows Build Status]](https://ci.appveyor.com/project/github/cmark)
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 `cmark-gfm` is an extended version of the C reference implementation of
 [CommonMark], a rationalized version of Markdown syntax with a spec.  This
 repository adds GitHub Flavored Markdown extensions to