Update devcontainer.

Author: hscells

.devcontainer/devcontainer.json

@@ -23,13 +23,16 @@
 
 	// Configure tool-specific properties.
 	"customizations": {
-		// Set *default* container specific settings.json values on container create.
-		"settings": { 
-			// Add the IDs of extensions you want installed when the container is created.
-			"extensions": [
-				"ms-python.python",
-				"ms-python.vscode-pylance"
-			]
+		// Configure properties specific to VS Code.
+		"vscode": {
+			// Set *default* container specific settings.json values on container create.
+			"settings": { 
+				// Add the IDs of extensions you want installed when the container is created.
+				"extensions": [
+					"ms-python.python",
+					"ms-python.vscode-pylance"
+				]
+			}
 		}
 	}