Merge pull request #3597 from dgarros/patch-1

Update pillow version to 6.2.0

requirements.txt

@@ -16,7 +16,7 @@ graphviz==0.10.1
 Jinja2==2.10.1
 Markdown==2.6.11
 netaddr==0.7.19
-Pillow==6.0.0
+Pillow==6.2.0
 psycopg2-binary==2.8.3
 py-gfm==0.1.4
 pycryptodome==3.8.2