Pin pillow to 5.3.0

requirements/constraints.txt

@@ -15,6 +15,9 @@ six==1.11.0
 # Convert text markup to HTML; used in capa problems, forums, and course wikis; pin Markdown version as tests failed for its upgrade to latest release
 Markdown==2.6.11
 
+# 5.4.0 causes cms/djangoapps/api/v1/tests/test_views/test_course_runs.py::CourseRunViewSetTests::test_images_upload to fail
+pillow==5.3.0
+
 # required by edx-lint and pinned explicitly here because newer versions don't guarantee python 2 support.
 # Can be removed when we get to Python 3.
 pylint-plugin-utils==0.3

requirements/edx/base.txt

@@ -182,7 +182,7 @@ paver==1.3.4
 pbr==5.1.1
 pdfminer==20140328
 piexif==1.0.2
-pillow==5.4.0
+pillow==5.3.0
 polib==1.1.0              # via edx-i18n-tools
 psutil==1.2.1
 py2neo==3.1.2

requirements/edx/development.txt

@@ -233,7 +233,7 @@ paver==1.3.4
 pbr==5.1.1
 pdfminer==20140328
 piexif==1.0.2
-pillow==5.4.0
+pillow==5.3.0
 pip-tools==3.2.0
 pluggy==0.8.0
 polib==1.1.0

requirements/edx/testing.txt

@@ -224,7 +224,7 @@ paver==1.3.4
 pbr==5.1.1
 pdfminer==20140328
 piexif==1.0.2
-pillow==5.4.0
+pillow==5.3.0
 pluggy==0.8.0             # via pytest, tox
 polib==1.1.0
 psutil==1.2.1