Merge pull request #16 from quinngroup/dependabot/pip/pillow-8.1.1

Bump pillow from 7.2.0 to 8.1.1

Author: magsol

requirements.txt

@@ -16,7 +16,7 @@ matplotlib==3.1.2
 networkx==2.4
 numpy==1.18.1
 opencv-python==4.1.2.30
-Pillow==7.2.0
+Pillow==8.1.1
 pip==19.3
 pyparsing==2.4.6
 python-dateutil==2.8.1