extra \n in hicpro2fithic.py

[ay-lab]

Hi Nicolas and everyone. A user of fithic brought it to our attention that this script produces extra empty lines. It seems like there is an extra \n in Line 87 of the script. Could you remove that when you can? Thank you!
https://github.com/nservant/HiC-Pro/blob/master/bin/utils/hicpro2fithic.py#L87