fix broken links in CHANGELOG.md [ci skip]

Author: boneskull

CHANGELOG.md

@@ -18,12 +18,14 @@
 
 [#2997]: https://github.com/mochajs/mocha/pull/2997
 [#2957]: https://github.com/mochajs/mocha/pull/2957
+[#2918]: https://github.com/mochajs/mocha/pull/2918
 [#2986]: https://github.com/mochajs/mocha/pull/2986
-[#2992]: https://github.com/mochajs/mocha/pull/2922
+[#2922]: https://github.com/mochajs/mocha/pull/2922
 [#2981]: https://github.com/mochajs/mocha/pull/2981
 [@solodynamo]: https://github.com/solodynamo
 [@jkrems]: https://github.com/jkrems
 [@jsoref]: https://github.com/jsoref
+
 # 3.5.0 / 2017-07-31
 
 ## :newspaper: News