FIX: use supported attribute to check pillow version

tacaswell · tacaswell · commit 3369e3bc24f9 · 2020-01-03T20:32:02.000-05:00
the PILLOW_VERSION attribute was deprecated in pillow 5.2 and removed in pillow 7.0. The __version__ attribute is present in the minimum version we check (3.4). closes #16083
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -54,7 +54,7 @@
 from matplotlib.path import Path
 
 try:
-    from PIL import PILLOW_VERSION
+    from PIL import __version__ as PILLOW_VERSION
     from distutils.version import LooseVersion
     if LooseVersion(PILLOW_VERSION) >= "3.4":
         _has_pil = True
