Add customizations (#19)

.devcontainer/devcontainer.json

@@ -13,6 +13,10 @@
 		}
 	},
 		
+	// Configure tool-specific properties.
+	"customizations": {
+		// Configure properties specific to VS Code.
+		"vscode": {
 			// Set *default* container specific settings.json values on container create.
 			"settings": { 
 				"php.validate.executablePath": "/usr/local/bin/php"
@@ -23,7 +27,9 @@
 				"felixfbecker.php-debug",
 				"bmewburn.vscode-intelephense-client",
 				"mrmlnc.vscode-apache"
-	],
+			]
+		}
+	},
 
 	// Use 'forwardPorts' to make a list of ports inside the container available locally.
 	// "forwardPorts": [8080],