fix javadoc warning

src/main/java/com/imyeyu/spring/entity/BaseEntity.java

@@ -13,6 +13,12 @@ import java.io.Serializable;
  */
 public class BaseEntity implements Serializable, Creatable, Updatable, Deletable {
 
+	/**
+	 * 创建基础实体
+	 */
+	public BaseEntity() {
+	}
+
 	/** 创建时间 */
 	protected Long createdAt;