refactor

sharding-jdbc-config-parent/sharding-jdbc-config-common/src/main/java/com/dangdang/ddframe/rdb/sharding/config/common/api/ShardingRuleBuilder.java

@@ -59,7 +59,7 @@ import java.util.Map.Entry;
  * @author gaohongtao
  */
 @AllArgsConstructor
-public class ShardingRuleBuilder {
+public final class ShardingRuleBuilder {
     
     private final String logRoot;