update README.md, fix markdown cron schedule section

Author: Zeyu Ye

README.md

@@ -195,7 +195,7 @@ $ docker run -d \
   blacklabelops/logrotate
 ~~~~
 
-> This will logrotate on go-cron schedule "* * * * * *" (every second).
+> This will logrotate on go-cron schedule \* \* \* \* \* \* (every second).
 
 # Log and View the Logrotate Output