Add more recent contributors to AUTHORS
Add more recent contributors to AUTHORS

(cherry picked from commit bd33fd0435b2d0dc97a7abb3e68b594185f4e6c3)

pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1