Fix: require >= v.1.9.1, <2.0.0 for pydantic (#660)

* Fix: require >= v.1.9.1 for pydantic

* Add <2.0.0 for pydantic

Author: georgesittas

setup.py

@@ -35,7 +35,7 @@
         "hyperscript",
         "jinja2",
         "pandas",
-        "pydantic",
+        "pydantic>=1.9.1,<2.0.0",
         "requests",
         "rich",
         "ruamel.yaml",