fixed typo

README.md

@@ -82,7 +82,7 @@ with later timestamps to avoid duplicate posts. On the first run the timestamp w
             ;; any posts not matching the regexes will be filtered out
             :keyword-filters [".*clojure.*"]
 	    ;; Replace Twitter links by Nitter
-	    : nitter-urls? false}}
+	    :nitter-urls? false}}
 ```
 
 * the bot looks for `config.edn` at its relative path by default, an alternative location can be specified either using the `MASTODON_BOT_CONFIG` environment variable or passing the path to config as an argument