Merge pull request #305 from mozilla/fix_protobuf_version

Pin protobuf version to <= 3.20.1
Tensorboard is not compatible with newer versions of protobuf.  Until tensorflow/tensorboard#5708 is resolved we need to pin protobuf to <= 3.20.1

Author: gleonard-m

cli/setup.py

@@ -20,7 +20,8 @@
         'scikit-learn>=0.22.2',
         'selenium>=3.141.0',
         'tensorboardX>=1.6,<2.0',
-        'torch>=1.0,<2.0'
+        'torch>=1.0,<2.0',
+        'protobuf <= 3.20.1',
     ],
     dependency_links=[
         'https://download.pytorch.org/whl/cu110/torch_stable.html'