With new WordPress plugin you can improve your websites security by disabling a few insecure features. You can automatically hide the readme.html file, license.txt file, set permissions for wp-config.php and .htaccess file so that hackers cannot modify them.
Simply install and activate disable insecure features plugin and your are done. It has an admin area page Dashboard -> Settings -> Disable Insecure Features but currently there are no options, developers are planning to let you re-enable different insecure features from that admin page area in an update.