README typo

[mhebrard]

I notice a problem on the README

$ python FDR.py input > output

I ran the script today and get the error

Traceback (most recent call last):
  File "FDR.py", line 55, in <module>
    ofile=open(sys.argv[2],'w');ofile.write(title[:-1]+'\tFDR\n');
IndexError: list index out of range

the command should be:

$ python FDR.py input output

Then the code works.