update CHANGELOG.md for v3.5.1 [ci skip]

CHANGELOG.md

@@ -1,3 +1,29 @@
+# 3.5.1 / 2017-09-09
+
+## :newspaper: News
+
+- :mega: Mocha is now sponsoring [PDXNode](http://pdxnode.org)!  If you're in the [Portland](https://wikipedia.org/wiki/Portland,_Oregon) area, come check out the monthly talks and hack nights!
+
+## :bug: Fixes
+
+- [#2997]: Fix missing `xit` export for "require" interface ([@solodynamo])
+- [#2957]: Fix unicode character handling in XUnit reporter failures ([@jkrems])
+
+## :nut_and_bolt: Other
+
+- [#2986]: Add issue and PR templates ([@kungapal])
+- [#2918]: Drop bash dependency for glob-related tests ([@ScottFreeCode])
+- [#2922]: Improve `--compilers` coverage ([@ScottFreeCode])
+- [#2981]: Fix tpyos and spelling errors ([@jsoref])
+
+[#2997]: https://github.com/mochajs/mocha/pull/2997
+[#2957]: https://github.com/mochajs/mocha/pull/2957
+[#2986]: https://github.com/mochajs/mocha/pull/2986
+[#2992]: 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