Add Iron to Silver Chest Upgrade

src/main/java/cpw/mods/ironchest/ChestChangerType.java

@@ -28,7 +28,8 @@ public enum ChestChangerType {
     DIAMONDCRYSTAL(DIAMOND, CRYSTAL, "diamondCrystalUpgrade", "Diamond to Crystal Chest Upgrade", "GGG", "GOG", "GGG"),
     WOODIRON(WOOD, IRON, "woodIronUpgrade", "Normal chest to Iron Chest Upgrade", "mmm", "msm", "mmm"),
     WOODCOPPER(WOOD, COPPER, "woodCopperUpgrade", "Normal chest to Copper Chest Upgrade", "mmm", "msm", "mmm"),
-    DIAMONDOBSIDIAN(DIAMOND, OBSIDIAN, "diamondObsidianUpgrade", "Diamond to Obsidian Chest Upgrade", "mmm", "mGm", "mmm");
+    DIAMONDOBSIDIAN(DIAMOND, OBSIDIAN, "diamondObsidianUpgrade", "Diamond to Obsidian Chest Upgrade", "mmm", "mGm", "mmm"),
+    IRONSILVER(IRON, SILVER, "ironSilverUpgrade", "Iron to Silver Chest Upgrade", "mGm", "GsG", "mGm");
 
     private IronChestType source;
     private IronChestType target;

src/main/resources/assets/ironchest/lang/en_US.lang

@@ -16,6 +16,7 @@ item.ironchest:DIAMONDCRYSTAL.name=Diamond to Crystal Chest Upgrade
 item.ironchest:WOODIRON.name=Wood to Iron Chest Upgrade
 item.ironchest:WOODCOPPER.name=Wood to Copper Chest Upgrade
 item.ironchest:DIAMONDOBSIDIAN.name=Diamond to Obsidian Chest Upgrade
+item.ironchest:IRONSILVER.name=Iron to Silver Chest Upgrade
 
 book.ironchest:dirtchest9000.title=How to use your DirtChest 9000!
 book.ironchest:dirtchest9000.page1=Welcome to your new DirtChest 9000! We hope you will enjoy many happy years of storing your stack of dirt in our storage utility.