move AssetsManager to another package

src/main/java/ghast/GhastTools.java

@@ -1,5 +1,6 @@
 package ghast;
 
+import ghast.assets.AssetsManager;
 import lombok.experimental.UtilityClass;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.bukkit.plugin.Plugin;

src/main/java/ghast/assets/AssetsException.java

@@ -1,4 +1,4 @@
-package ghast;
+package ghast.assets;
 
 public class AssetsException extends RuntimeException {
 

src/main/java/ghast/assets/AssetsManager.java

@@ -1,5 +1,6 @@
-package ghast;
+package ghast.assets;
 
+import ghast.GhastTools;
 import lombok.experimental.UtilityClass;
 import org.bukkit.plugin.Plugin;