Fix DefaultStringRedisConnection not passing begin/end to bitCount method

DATAREDIS-216

src/main/java/org/springframework/data/redis/connection/DefaultStringRedisConnection.java

@@ -1089,7 +1089,7 @@ public class DefaultStringRedisConnection implements StringRedisConnection {
 	}
 
 	public Long bitCount(String key, long begin, long end) {
-		return delegate.bitCount(serialize(key));
+		return delegate.bitCount(serialize(key), begin, end);
 	}
 
 	public Long bitOp(BitOperation op, String destination, String... keys) {