Remove downstream reliance on fixed python version. (#46)

Author: DavidSouther

setup.py

@@ -11,7 +11,6 @@
     entry_points={
         "console_scripts": ["doc-gen=aws_doc_sdk_examples_tools.doc_gen_cli:main"],
     },
-    python_requires=">=3.8,<3.9",
     build_requires=[
         "setuptools>=40.8.0",
         "wheel",