Fix build

And this is why we have CI. I had forgotten to commit one class...

lua4jvm/src/main/java/fi/benjami/code4jvm/lua/stdlib/LuaException.java

@@ -0,0 +1,22 @@
+package fi.benjami.code4jvm.lua.stdlib;
+
+public class LuaException extends RuntimeException {
+
+	private static final long serialVersionUID = 1L;
+
+	private final Object message;
+
+	public LuaException(Object message) {
+		super(message.toString());
+		this.message = message;
+	}
+
+	public LuaException(Object message, Throwable cause) {
+		super(message.toString(), cause);
+		this.message = message;
+	}
+
+	public Object getLuaMessage() {
+		return message;
+	}
+}