Add note about biome ids in 1.7

Author: rutgerkok

common/src/com/khorn/terraincontrol/configuration/WorldConfig.java

@@ -597,7 +597,8 @@ protected void writeConfigSettings() throws IOException
         writeComment("snowfall and mobs to work as in the other biome.");
         writeComment("");
         writeComment("The available ids range from 0 to 255 and the ids 0 to " + (DefaultBiome.values().length - 1) + " are occupied by vanilla minecraft");
-        writeComment("biomes. To leave room for new vanilla biomes, it is recommend to not use ids below 30.");
+        writeComment("biomes. Minecraft 1.7 will take most ids in the range 23-39 and 129-167.");
+        // TODO: update above message when MC 1.7 is out
 
         WriteCustomBiomes();