pin pydantic to <2.0 (#339)

Author: bfineran

setup.py

@@ -45,7 +45,7 @@
     "pyyaml>=5.1.0",
     "requests>=2.0.0",
     "tqdm>=4.0.0",
-    "pydantic>=1.8.2",
+    "pydantic>=1.8.2,<2.0.0",
     "click>=7.1.2,!=8.0.0",  # latest version < 8.0 + blocked version with reported bug
     "protobuf>=3.12.2,<4",
     "pandas>1.3",