FIX: Allow discord.com webhook URLs

FIX: Allow discord.com webhook URLs

diff --git a/lib/discourse_chat/provider/discord/discord_provider.rb b/lib/discourse_chat/provider/discord/discord_provider.rb
index 439dbab..1f68fa9 100644
--- a/lib/discourse_chat/provider/discord/discord_provider.rb
+++ b/lib/discourse_chat/provider/discord/discord_provider.rb
@@ -8,7 +8,7 @@ module DiscourseChat
 
       CHANNEL_PARAMETERS = [
         { key: "name", regex: '^\S+' },
-        { key: "webhook_url", regex: '^https:\/\/discordapp\.com\/api\/webhooks\/', unique: true, hidden: true }
+        { key: "webhook_url", regex: '^https:\/\/discord(?:app)?\.com\/api\/webhooks\/', unique: true, hidden: true }
       ].freeze
 
       def self.send_message(url, message)

GitHub sha: bb4143a6