riotctrl_shell: fix riotctrl url in requirements.txt
riotctrl_shell: fix riotctrl url in requirements.txt

RIOT-OS/RIOT,jasonatran/RIOT,kYc0o/RIOT,ant9000/RIOT,authmillenon/RIOT,OTAkeys/RIOT,miri64/RIOT,OTAkeys/RIOT,RIOT-OS/RIOT,ant9000/RIOT,jasonatran/RIOT,miri64/RIOT,miri64/RIOT,ant9000/RIOT,kYc0o/RIOT,kaspar030/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,authmillenon/RIOT,OlegHahm/RIOT,kYc0o/RIOT,miri64/RIOT,jasonatran/RIOT,authmillenon/RIOT,authmillenon/RIOT,RIOT-OS/RIOT,jasonatran/RIOT,RIOT-OS/RIOT,ant9000/RIOT,kYc0o/RIOT,kaspar030/RIOT,OlegHahm/RIOT,jasonatran/RIOT,OTAkeys/RIOT,OTAkeys/RIOT,kaspar030/RIOT,kaspar030/RIOT,miri64/RIOT,authmillenon/RIOT,OlegHahm/RIOT,OlegHahm/RIOT,kYc0o/RIOT,ant9000/RIOT,OTAkeys/RIOT,kaspar030/RIOT,OlegHahm/RIOT