comment about three.js 162

Author: OpenDEM

README.md

@@ -8,5 +8,5 @@ You could choose from different free STL and GLB models, or upload your own data
 
 Only simple GLB models and KTX2 compression is supported.
 
-
-
+Based on three.js 162 for the following reason pointed out by Donmccurdy:
+Three.js v163 removed support for WebGL 1, but 3d2png depends on headless-gl, which only supports WebGL 1. Assuming 3D and 3D2PNG should use the same three.js versions for consistency, three.js v162 is used for both now.