deprecate {key_amount} and replace it with {required_amount}

{key_amount} will work until the next major version of Minecraft

src/main/java/com/badbones69/crazycrates/config/impl/messages/CrateKeys.java

@@ -28,8 +28,8 @@ public void registerComments(CommentsConfiguration conf) {
     @Comment("A list of available placeholders: {number}")
     public static final Property<String> not_a_number = newProperty("crates.requirements.not-a-number", "{prefix}<gold>{number} <red>is not a number.");
 
-    @Comment("A list of available placeholders: {prefix}, {amount}, {key_amount}, {crate}")
-    public static final Property<String> required_keys = newProperty("crates.requirements.not-enough-keys", "{prefix}<gray>You need <red>{key_amount} <gray>keys to open <red>{crate}. <gray>You have <red>{amount}.");
+    @Comment("A list of available placeholders: {amount}, {required_amount}, {crate}")
+    public static final Property<String> not_enough_keys = newProperty("crates.requirements.not-enough-keys", "{prefix}<gray>You need <red>{key_amount} <gray>keys to open <red>{crate}. <gray>You have <red>{amount}.");
 
     public static final Property<String> not_on_block = newProperty("crates.not-a-block", "{prefix}<red>You must be standing on a block to use <gold>{crate}.");
 

src/main/java/com/badbones69/crazycrates/listeners/CrateControlListener.java

@@ -156,7 +156,7 @@ public void onRightClick(PlayerInteractEvent event) {
             final Map<String, String> placeholders = new HashMap<>();
 
             placeholders.put("{required_amount}", String.valueOf(requiredKeys));
-            placeholders.put("{crate}", crate.getPreviewName());
+            placeholders.put("{key_amount}", String.valueOf(requiredKeys)); // deprecated, remove in next major version of minecraft.
             placeholders.put("{amount}", String.valueOf(totalKeys));
             placeholders.put("{crate}", crate.getPreviewName());
             placeholders.put("{key}", crate.getKeyName());