Update pillow from 5.1.0 to 5.2.0

pyup-bot · pyup-bot · commit 134705369810 · 2018-07-01T22:33:00.000+01:00
diff --git a/requirements.txt b/requirements.txt
@@ -1,4 +1,4 @@
-pillow==5.1.0  # Image library.
+pillow==5.2.0  # Image library.
 pytz==2018.5
 requests-mock==1.5.0  # Mock `requests`.
 requests==2.19.1
