Move UpdateStrategy classes to strategy package

item 패키지를 만들까 했는데, depth 증가보다는 strategy만 두는거로..

Java/src/main/java/com/gildedrose/GildedRose.java

@@ -1,5 +1,7 @@
 package com.gildedrose;
 
+import com.gildedrose.strategy.*;
+
 import java.util.HashMap;
 
 class GildedRose {

Java/src/main/java/com/gildedrose/strategy/AgedBrieUpdateStrategy.java

@@ -1,4 +1,6 @@
-package com.gildedrose;
+package com.gildedrose.strategy;
+
+import com.gildedrose.Item;
 
 public class AgedBrieUpdateStrategy implements ItemUpdateStrategy {
     @Override

Java/src/main/java/com/gildedrose/strategy/BackstagePassesUpdateStrategy.java

@@ -1,4 +1,6 @@
-package com.gildedrose;
+package com.gildedrose.strategy;
+
+import com.gildedrose.Item;
 
 public class BackstagePassesUpdateStrategy implements ItemUpdateStrategy {
     @Override

Java/src/main/java/com/gildedrose/strategy/ItemUpdateStrategy.java

@@ -1,4 +1,6 @@
-package com.gildedrose;
+package com.gildedrose.strategy;
+
+import com.gildedrose.Item;
 
 public interface ItemUpdateStrategy {
     void update(Item item);

Java/src/main/java/com/gildedrose/strategy/StandardItemUpdateStrategy.java

@@ -1,4 +1,6 @@
-package com.gildedrose;
+package com.gildedrose.strategy;
+
+import com.gildedrose.Item;
 
 public class StandardItemUpdateStrategy implements ItemUpdateStrategy {
     @Override

Java/src/main/java/com/gildedrose/strategy/SulfurasUpdateStrategy.java

@@ -1,4 +1,6 @@
-package com.gildedrose;
+package com.gildedrose.strategy;
+
+import com.gildedrose.Item;
 
 public class SulfurasUpdateStrategy implements ItemUpdateStrategy {
     @Override