Remove typo from README

README.md

@@ -12,7 +12,7 @@ Set the script to run on a schedule using Task Scheduler. It will need to run as
 
 The script takes one parameter - the port to bind SSL to. If this is omitted it will default to 443, but e.g. the Gamma server serves SSL on port 5729. In this case, you might import the included XML file, but then set the Task Scheduler command to be `powershell.exe` with arguments `-file C:\autocert\iis.ps1 -Port 5729`.
 
-A useful log output which will automatically be written to a log.txt file in the same directory as the script.
+A useful log output will automatically be written to a log.txt file in the same directory as the script.
 
 ## For Windows Servers Running Exchange 2010