fix: allow end-uers to use more modern version of matplotlib dep (#90)

* fix: allow end-users to use more modern version of matplotlib dep

matplotlib 3.0.1 is not compatible with python3.8 which is the default
python version for Ubuntu 20.0. Attempting installation will use the
`platform` module and expect it has `linux_distribution`, but this has
been moved to the `distro` module.

requirements.txt

@@ -7,7 +7,7 @@ diskcache>=4.1.0
 grpcio==1.41.0
 grpcio-tools==1.41.0
 isort==4.3.21
-matplotlib==3.0.3
+matplotlib>=3.0.3,<4.0
 opencv-python==4.5.3.56
 Pillow>=8.3.2
 pycocotools>=2.0.0