Allowing older version of pandas to be used (#33)

pyproject.toml

@@ -27,7 +27,7 @@ metaflow_executor = "datasets.plugins:MetaflowExecutor"
 
 [tool.poetry.dependencies]
 python = ">=3.9.0,<4"
-pandas = ">=1.4.0"
+pandas = ">=1.1.0"
 pyarrow = ">=6.0.0"
 dask = { version = ">=2021.9.1", optional = true }
 pyspark = { version = "^3.2.0", optional = true }