Fixed a warning

command/markov.go

@@ -924,7 +924,7 @@ func selectBestNextWord(options []string, wordHistory []string) string {
 		var fallbackOptions []string
 		for _, option := range options {
 			// Avoid repetition
-			if len(wordHistory) == 0 || strings.ToLower(wordHistory[len(wordHistory)-1]) != strings.ToLower(option) {
+			if len(wordHistory) == 0 || !strings.EqualFold(wordHistory[len(wordHistory)-1], option) {
 				fallbackOptions = append(fallbackOptions, option)
 			}
 		}