no \r\n at the end of file with justkeyvals

[johnny2002]

when I export key values to a csv file with justkeyvals, there is no \r\n at last line of the csv file.
this will cases the shell pipe don't know last line is finished.

[johnny2002]

in order to add a "\r\n" at the end of csv file, please add the following lines in callbacks.py line 268, that is, the end of KeyValsOnlyCallback section:

def end_rdb(self): self._out.write(b'\r\n')