add missing LuaFunction annotation

Author: zyxkad

src/main/java/de/srendi/advancedperipherals/common/addons/computercraft/peripheral/DistanceDetectorPeripheral.java

@@ -205,6 +205,7 @@ public final void setCalculatePeriodicallyLua(boolean shouldCalculatePeriodicall
         this.setCalculatePeriodically(shouldCalculatePeriodically);
     }
 
+    @LuaFunction
     public final double maxRange() {
         return this.getMaxRange();
     }