Update AUTHORS.md with latest contributors. (#150)

AUTHORS.md

@@ -6,3 +6,21 @@ Contributors in the order of first contribution
 * [Torin Rudeen](https://github.com/torinmr)
 * [Brian Atkinson](https://github.com/nairb774)
 * [Matt Harden](https://github.com/nerdatmath)
+* [Ryan Kennedy](https://github.com/ryankennedy)
+* [Brett Cannon](https://github.com/brettcannon)
+* [Alex Koren](https://github.com/AlexEKoren)
+* [Steven Maude](https://github.com/StevenMaude)
+* [feilengcui008](https://github.com/feilengcui008)
+* [Meador Inge](https://github.com/meadori)
+* [Kyoung-chan Lee](https://github.com/leekchan)
+* [Cholerae Hu](https://github.com/choleraehyq)
+* [Jurriaan Bremer](https://github.com/jbremer)
+* [Florian Ludwig](https://github.com/FlorianLudwig)
+* [ns-cweber](https://github.com/ns-cweber)
+* [Paul Smith](https://github.com/paulsmith)
+* [Izaak Weiss](https://github.com/lalaithion)
+* [YOU](https://github.com/S-YOU)
+* [iury](https://github.com/IuryAlves)
+* [wuttem](https://github.com/wuttem)
+* [cclauss](https://github.com/cclauss)
+* [Mirko Dziadzka](https://github.com/MirkoDziadzka)