PIN verification, notifications, multiple notif providers

Discord, Email & Telegram can be enabled, although email is always
enabled right now (will fix). Also apparently markdown hyperlinks don't
work in Discord, eventually will implement something to convert them to
embeds.

storage.go

@@ -39,11 +39,12 @@ type TelegramUser struct {
 }
 
 type DiscordUser struct {
-	ChannelID string
-	ID        string
-	Username  string
-	Lang      string
-	Contact   bool
+	ChannelID     string
+	ID            string
+	Username      string
+	Discriminator string
+	Lang          string
+	Contact       bool
 }
 
 type customEmails struct {