Reinstate 'Long term contributors' section

contributors.md

@@ -11,6 +11,12 @@ Includes all git commit authors. Aliases are GitHub user names.
 * (zsilencer) - Developer
 * Richard Jenkins (rwjuk) - Developer, issue management
 
+## Long term contributors
+The following people are not part of the project team, but have been contributing for a long time.
+* Hielke Morsink (Broxzier)
+* Matte Andersson (Nubbie)
+* (wolfreak99)
+
 ## Implementation (RCT2)
 * Ted John (IntelOrca)
 * Duncan Frost (duncanspumpkin)
@@ -33,6 +39,7 @@ Includes all git commit authors. Aliases are GitHub user names.
 * Inseok Lee (dlunch) - Original command line
 * Lewis Fox (LRFLEW) - Misc.
 * Marijn van der Werf (marijnvdwerf) - Drawing, misc.
+* Hielke Morsink (Broxzier) - Tile inspector, heightmap loader, misc.
 
 ## Additional implementation (OpenRCT2)
 * (atmaxinger) - User configuration
@@ -55,7 +62,6 @@ Includes all git commit authors. Aliases are GitHub user names.
 * Daniel Trujillo Viedma (gDanix) - Custom currency.
 * Niels NTG Poldervaart (Niels-NTG) - Misc.
 * (zaxcav) - Improvements to original pathfinding algorithm.
-* Hielke Morsink (Broxzier) - Tile inspector, heightmap loader, misc.
 * Joël Troch (JoelTroch) - Keyboard shortcuts for ride construction.
 * Thomas Delebo (delebota) - Misc.
 * Brian Callahan (ibara) - OpenBSD port.