fix client methods in biome, fixes #870

src/main/java/carpet/fakes/BiomeEffectsInterface.java

@@ -0,0 +1,12 @@
+package carpet.fakes;
+
+import java.util.Optional;
+
+public interface BiomeEffectsInterface
+{
+    int getCMFogColor();
+    Optional<Integer> getCMFoliageColor();
+    int getCMSkyColor();
+    int getCMWaterColor();
+    int getCMWaterFogColor();
+}