doc: add note for supported python version (#54)

* doc: add note for supported python version

* ci: remove python3.7 action

.github/workflows/pr-check.yml

@@ -21,19 +21,19 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest]
-        python: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        python: ['3.8', '3.9', '3.10', '3.11']
 
     steps:
       - name: Checkout
         uses: actions/checkout@v3
         with:
           path: ${{ env.special-working-directory-relative }}
 
-      # Install bundled libs using 3.7 even though you test it on other versions.
-      - name: Use Python 3.7
+      # Install bundled libs using 3.8 even though you test it on other versions.
+      - name: Use Python 3.8
         uses: actions/setup-python@v4
         with:
-          python-version: '3.7'
+          python-version: '3.8'
 
       - name: Update pip, install wheel and nox
         run: python -m pip install -U pip wheel nox
@@ -44,7 +44,7 @@ jobs:
         run: python -m nox --session setup
         shell: bash
 
-      # Now that the bundle is installed to target using python 3.7
+      # Now that the bundle is installed to target using python 3.8
       # switch back the python we want to test with
       - name: Use Python ${{ matrix.python }}
         uses: actions/setup-python@v4

README.md

@@ -1,6 +1,8 @@
 # Vscode formatter extension support for python files using yapf
 
-A formatter extension with support for python files and notebook cell. Feel free to open an issue to tell me what feature else do you need since it's a preview version.
+A formatter extension with support for python files and notebook cell. Feel free to open an issue to tell me what feature else do you need since it's a preview version.  
+Note:  
+* This extension is supported for all [actively supported versions](https://devguide.python.org/versions/#supported-versions) of the python language (i.e., python >= 3.8(EOL: 2024-10)).
 
 ## Quick Start
 Setting the following can enable this formatter quickly.