MNT: Use version 1.5.3 to smooth transition to 3.6

Author: effigies

.travis.yml

@@ -44,7 +44,7 @@ matrix:
     # Absolute minimum dependencies plus oldest MPL
     - python: 3.5
       env:
-        - DEPENDS="-r min-requirements.txt matplotlib==1.5.2"
+        - DEPENDS="-r min-requirements.txt matplotlib==1.5.3"
     # Minimum pydicom dependency
     - python: 3.5
       env:

setup.cfg

@@ -48,7 +48,7 @@ dev =
     gitpython
     twine
 doc =
-    matplotlib >= 1.5.2
+    matplotlib >= 1.5.3
     numpydoc
     sphinx >=0.3
     texext