Add min required python version and ignore vscode settings file

Author: celiao

Diff for: .gitignore

@@ -18,3 +18,4 @@ htmlcov
 ## Vim files
 .*.swp
 .idea
+.vscode

Diff for: setup.py

@@ -22,6 +22,7 @@
     long_description=long_description,
     long_description_content_type="text/markdown",
     install_requires=['requests'],
+    python_requires='>=3.9',
     classifiers=[
         "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",