Readme typo for gettings the logs

Function get_files() doesn't exists, get_logs() does.
Str_replace for input get_log(), strip .log-part

Stripping the .log, so you can do a foreach($logs as $log): Logger::get_log($log)
Merge pull request #1 from Jaspur/master

Typo in readme, str_replace in get_log()