style: Change settings to apply Python isort

[#62] Refer to GitHub issue…

The purpose of this update is to fix VSCode setting in order to apply
Python isort properly.
isort will now be applied automatically on save, with its profile
setting based on Black.

.vscode/settings.json

@@ -216,8 +216,12 @@
   // Python formatter: PEP8
   "[python]": {
     "editor.formatOnSave": true,
-    "editor.defaultFormatter": "ms-python.autopep8"
+    "editor.defaultFormatter": "ms-python.autopep8",
+    "editor.codeActionsOnSave": {
+      "source.organizeImports": true
+    }
   },
+  "isort.args": ["--profile", "black"],
 
   // Python testing: PyTest
   "python.testing.pytestArgs": ["tests"],