Update Authors with new Urho contributors

AUTHORS.md

@@ -76,6 +76,7 @@ Urho3D development, contributions and bugfixes by:
 - Josh Engebretson
 - Chris Friesen
 - Alex Fuller
+- Henrik Heino
 - Mika Heinonen
 - Jukka Jylänki
 - Graham King
@@ -84,6 +85,7 @@ Urho3D development, contributions and bugfixes by:
 - Gunnar Kriik
 - Aliaksandr Kryvashein
 - Artem Kulyk
+- Rokas Kupstys
 - Ali Kämäräinen
 - Pete Leigh
 - Frode 'Modanung' Lindeijer
@@ -109,17 +111,18 @@ Urho3D development, contributions and bugfixes by:
 - Yusuf Umar
 - Daniel Wiberg
 - Steven Zhang
-- Rokas Kupstys
 - AGreatFish
 - BlueMagnificent
 - Enhex
 - Firegorilla
+- Gordon-F
 - Lumak
 - Magic.Lixin
 - Mike3D
 - MonkeyFirst
 - Newb I the Newbd
 - OvermindDL1
+- Scellow
 - Skrylar
 - TheComet93
 - Y-way