Support message placeholders and configuration of message

main.go

@@ -21,10 +21,14 @@ var (
 func setupConfiguration() {
 	viper.SetDefault("prohibitedPhrases", "")
 	viper.SetDefault("channels", "")
+	viper.SetDefault("message", "Hi {username}, you've posted a message that was automatically removed for matching a filter. If you  need help, please use the correct channel.")
 
 	viper.AutomaticEnv()
 
 	viper.SetConfigName("ottomate")
+	viper.AddConfigPath("/etc/ottomate/")
+	viper.AddConfigPath("$HOME/.ottomate")
+	viper.AddConfigPath(".")
 
 	viper.ReadInConfig()
 }
@@ -154,7 +158,11 @@ func messageCreate(e *gateway.MessageCreateEvent) {
 		return
 	}
 
-	_, err = s.SendText(ch.ID, "")
+	message := viper.GetString("message")
+
+	replacer := strings.NewReplacer("{username}", e.Author.Username, "{message}", e.Content)
+
+	_, err = s.SendText(ch.ID, replacer.Replace(message))
 
 	if err != nil {
 		// Unable to send message