Merge pull request #939 from Trusted-AI/dependabot/pip/matplotlib-3.3.4

Bump matplotlib from 3.3.3 to 3.3.4

Author: beat-buesser

requirements.txt

@@ -1,7 +1,7 @@
 # base
 numpy>=1.18.0
 scipy==1.4.1
-matplotlib==3.3.3
+matplotlib==3.3.4
 scikit-learn>=0.22.2,==0.23.*
 six==1.15.0
 Pillow==7.2.0