Update README.md

Update download URL to v9.

README.md

@@ -66,10 +66,10 @@ Choose one of the following options:
   your project directory.
 
 - Download the latest stable release from
-  [here](https://github.com/h5bp/html5-boilerplate/releases/download/v8.0.0/html5-boilerplate_v8.0.0.zip). This zip file is a
+  [here](https://github.com/h5bp/html5-boilerplate/releases/download/v9.0.0/html5-boilerplate_v9.0.0.zip). This zip file is a
   snapshot of the `dist` folder. On Windows, Mac and from the file manager on
   Linux unzipping this folder will output to a folder named something like
-  `html5-boilerplate_v8.0.0`. From the command-line, you will need to create a
+  `html5-boilerplate_v9.0.0`. From the command-line, you will need to create a
   folder and unzip the contents into that folder.
 
   ```bash