README - use commonmark/cmark for appveyor badge.

Author: jgm

README.md

@@ -2,7 +2,7 @@ cmark
 =====
 
 [![Build Status]](https://travis-ci.org/commonmark/cmark)
-[![Windows Build Status]](https://ci.appveyor.com/project/jgm/cmark)
+[![Windows Build Status]](https://ci.appveyor.com/project/commonmark/cmark)
 
 `cmark` is the C reference implementation of [CommonMark], a
 rationalized version of Markdown syntax with a [spec][the spec].
@@ -193,6 +193,6 @@ most of the C library's API and its test harness.
 [re2c]: http://re2c.org
 [commonmark.js]: https://github.com/commonmark/commonmark.js
 [Build Status]: https://img.shields.io/travis/commonmark/cmark/master.svg?style=flat
-[Windows Build Status]: https://ci.appveyor.com/api/projects/status/32r7s2skrgm9ubva?svg=true
+[Windows Build Status]: https://ci.appveyor.com/api/projects/status/h3fd91vtd1xfmp69?svg=true
 [american fuzzy lop]: http://lcamtuf.coredump.cx/afl/
 [libFuzzer]: http://llvm.org/docs/LibFuzzer.html