Merge pull request #551 from Trusted-AI/dependabot/pip/matplotlib-3.3.1

Bump matplotlib from 3.2.1 to 3.3.1

Author: beat-buesser

requirements.txt

@@ -1,7 +1,7 @@
 # base
 numpy==1.18.1
 scipy==1.4.1
-matplotlib==3.2.1
+matplotlib==3.3.1
 scikit-learn==0.22.1
 six==1.15.0
 Pillow==7.2.0