added java version note to readme

README.md

@@ -8,8 +8,11 @@ This library requires:
 * Lemur 1.16
 * Heart
 * Boost (my personal utilities)
+* Java 8 required, Java 17 suggested (see note below)
 
 Demos additionally require:
 * SkyControl
 
 All, except Boost, are common libraries for JMonkeyEngine.
+
+This library was intended to only require Java 8, but due to a mistake, Java 17 is required. However, by changing the source code to remove a single override annotation in `codex.vfx.utils.VfxRandomGenerator`, you can restore Java 8 compatibility. I am working on fixing this issue, but in the meantime, sorry for the inconvenience.