Disabled rivers in some biomes

src/main/java/biomesoplenty/common/biome/overworld/BiomeGenHighland.java

@@ -35,6 +35,7 @@ public class BiomeGenHighland extends BOPBiome
         this.setColor(0x7CAD66);
         this.setTemperatureRainfall(0.5F, 0.8F);
         
+        this.canGenerateRivers = false;
         this.canGenerateVillages = false;
         
         this.addWeight(BOPClimates.COOL_TEMPERATE, 7);

src/main/java/biomesoplenty/common/biome/overworld/BiomeGenRainforest.java

@@ -45,6 +45,7 @@ public class BiomeGenRainforest extends BOPBiome
         
         this.canSpawnInBiome = false;
         this.canGenerateVillages = false;
+        this.canGenerateRivers = false;
         
         this.spawnableMonsterList.add(new SpawnListEntry(EntityOcelot.class, 2, 1, 1));
         this.spawnableCreatureList.add(new SpawnListEntry(EntityButterfly.class, 6, 2, 4));

src/main/java/biomesoplenty/common/biome/overworld/BiomeGenTundra.java

@@ -40,6 +40,7 @@ public class BiomeGenTundra extends BOPBiome
         
         this.addWeight(BOPClimates.TUNDRA, 10);
         
+        this.canGenerateRivers = false;
         this.canSpawnInBiome = false;
         
         this.spawnableCreatureList.clear();