Fix syntax warning in main.py

[AlyaGomaa]

Cmd: ./slips.py -e 1 -t -f dataset/test7-malicious.pcap -P 6666
Slips Version: 1.1.5 (9a95de8)

Error:
/StratosphereLinuxIPS/slips/main.py:329: SyntaxWarning: invalid escape sequence '\s'
"\s{1,}-\s{1,}", first_line

[Sekhar-Kumar-Dash]

can i work on this issue @AlyaGomaa if you don't mind

[AlyaGomaa]

hellooo @Sekhar-Kumar-Dash sure you can work on it. assigned it to you