Lock to Polaris 2.0 beta 9

Author: ry5n

README.md

@@ -11,7 +11,7 @@ npm install
 npm start
 ```
 
-This runs the app in the development mode. If you prefer, you can run these commands using Yarn.
+This runs the app in the development mode.
 
 - Open [http://localhost:3000](http://localhost:3000) to view it in the browser
 - The page will reload if you make edits

package.json

@@ -3,7 +3,7 @@
   "version": "0.1.0",
   "private": true,
   "dependencies": {
-    "@shopify/polaris": ">=2.0.0-beta",
+    "@shopify/polaris": "2.0.0-beta.9",
     "classnames": "^2.2.5",
     "react": "^16.2.0",
     "react-dom": "^16.2.0",