Update Pillow, allowing tox tests with Py 3.9.

Author: Cito

.github/workflows/test-package.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        python-version: [3.6, 3.7, 3.8]
+        python-version: [3.6, 3.7, 3.8, 3.9]
 
     steps:
     - uses: actions/checkout@v2

setup.py

@@ -19,7 +19,7 @@
 ]
 requireExamples = [
     'DBUtils>=2,<4', 'dominate>=2.5,<3', 'yattag>=1.13,<2',
-    'Pygments>=2.6,<3', 'Pillow>=7,<9'
+    'Pygments>=2.6,<3', 'Pillow>=8,<9'
 ]
 requireTests = [
     'psutil>=5.7,<6', 'flake8>=3.8,<4', 'pylint>=2.6,<3', 'tox>=3.20,<4',

tox.ini

@@ -1,5 +1,5 @@
 [tox]
-envlist = py{36,37,38}, flake8, pylint, docs, manifest
+envlist = py{36,37,38,39}, flake8, pylint, docs, manifest
 
 [testenv:flake8]
 basepython = python3.8