also allow shadows

Author: Telesphoreo

src/main/java/dev/plex/module/minimessage/chatstyle/ChatStyles.java

@@ -23,6 +23,7 @@ public class ChatStyles
     // Opt in to color tags only, so a future standard tag does not expand what a style can do.
     private static final MiniMessage COLORS = MiniMessage.builder().tags(TagResolver.resolver(
             StandardTags.color(),
+            StandardTags.shadowColor(),
             StandardTags.gradient(),
             StandardTags.rainbow(),
             StandardTags.transition(),

src/main/resources/messages.yml

@@ -2,5 +2,5 @@ nickUnavailable: "<red>EssentialsX is not enabled, so nicknames are unavailable.
 chatStyleSet: "<gray>Your chat style is set. Your messages now look like this:"
 chatStyleCleared: "<gray>Your chat style is off. Your messages now look like this:"
 chatStyleExample: "<gray>Example: <white>/chatstyle \\<gradient:red:blue>"
-chatStyleInvalid: "<red>A chat style is one or more color tags, for example <white>\\<gradient:red:blue><red>, <white>\\<rainbow><red>, <white>\\<pride><red>, or <white>\\<#ff8800><red>. The maximum length is 255 characters."
+chatStyleInvalid: "<red>A chat style is one or more color tags, for example <white>\\<gradient:red:blue><red>, <white>\\<rainbow><red>, <white>\\<pride><red>, <white>\\<#ff8800><red>, or <white>\\<shadow:black><red>. The maximum length is 255 characters."
 chatStyleFailed: "<red>The server could not save your chat style."