AIP-6913 support Py3.8 (#34)

pyproject.toml

@@ -1,13 +1,13 @@
 [tool.poetry]
 name = "zdatasets"
-version = "0.2.3"
+version = "0.2.4"
 description = "Dataset SDK for consistent read/write [batch, online, streaming] data."
 classifiers = [
   "Development Status :: 2 - Pre-Alpha",
   "Intended Audience :: Developers",
   "License :: OSI Approved :: Apache Software License",
   "Natural Language :: English",
-  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.8",
 ]
 authors = ["Taleb Zeghmi"]
 readme = "README.md"
@@ -26,7 +26,7 @@ hive_dataset = "datasets.plugins:HiveDataset"
 metaflow_executor = "datasets.plugins:MetaflowExecutor"
 
 [tool.poetry.dependencies]
-python = ">=3.9.0,<4"
+python = ">=3.8.0,<4"
 pandas = ">=1.1.0"
 pyarrow = ">=6.0.0"
 dask = { version = ">=2021.9.1", optional = true }