add default implement for isDeleted()

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

@@ -1,5 +1,7 @@
 package com.imyeyu.spring.entity;
 
+import com.imyeyu.utils.Time;
+
 /**
  * 可软删除实体
  *
@@ -27,5 +29,7 @@ public interface Deletable {
 	 *
 	 * @return true 为已删除
 	 */
-	boolean isDeleted();
+	default boolean isDeleted() {
+		return getDeletedAt() != null && getDeletedAt() < Time.now();
+	}
 }