fix security vulnerabilities in Pillow package CVE-2020-10994 and CVE-2020-11538
fix security vulnerabilities in Pillow package
CVE-2020-10994 and CVE-2020-11538

uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/OSIS-Louvain