Added watch mode in storybook config

Author: AlexanderYW

.storybook/main.js

@@ -10,6 +10,7 @@ module.exports = {
     // `configType` has a value of 'DEVELOPMENT' or 'PRODUCTION'
     // You can change the configuration based on that.
     // 'PRODUCTION' is used when building the static version of storybook.
+    config.watch = true
 
     // Make whatever fine-grained changes you need
     config.module.rules.push({