Increased minimum Python version (#1179)

Author: sliverc

setup.py

@@ -105,6 +105,6 @@ def get_package_data(package):
         "openapi": ["pyyaml>=5.4", "uritemplate>=3.0.1"],
     },
     setup_requires=wheel,
-    python_requires=">=3.7",
+    python_requires=">=3.8",
     zip_safe=False,
 )