Merge pull request #130 from CoderBotOrg/dependabot/pip/pillow-6.2.0

Bump pillow from 5.1.0 to 6.2.0

Author: previ

requirements_stub.txt

@@ -25,7 +25,7 @@ MarkupSafe==1.0
 numpy==1.14.3
 opencv-contrib-python==3.4.3.18
 pigpio==1.40.post1
-Pillow==5.1.0
+Pillow==6.2.0
 protobuf==3.6.1
 Pypubsub==4.0.0
 pytz==2018.4