Support store by default

rollup.config.js

@@ -23,6 +23,9 @@ export default {
 			css: css => {
 				css.write('public/bundle.css');
 			},
+			
+			// enable https://svelte.technology/guide#state-management
+			store: true,
 
 			// this results in smaller CSS files
 			cascade: false
@@ -41,4 +44,4 @@ export default {
 		production && buble({ exclude: 'node_modules/**' }),
 		production && uglify()
 	]
-};
+};