add use statements

src/entity/item/shield.rs

@@ -1,4 +1,5 @@
 use std::convert::{TryFrom, Into};
+use serde::{Serialize, Deserialize};
 
 #[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize, enum_utils::FromStr, derive_more::Display)]
 pub enum ShieldType {

src/entity/item/tool.rs

@@ -1,4 +1,4 @@
-
+use serde::{Serialize, Deserialize};
 
 #[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize, enum_utils::FromStr, derive_more::Display)]
 pub enum ToolType {

src/entity/item/unit.rs

@@ -1,4 +1,5 @@
 use std::convert::{TryFrom, Into};
+use serde::{Serialize, Deserialize};
 
 
 #[derive(Debug, Copy, Clone, PartialEq, Serialize, Deserialize, enum_utils::FromStr, derive_more::Display)]