Provided example of custom filename & localtion (chrisbateman#12)

Author: AlfredMachineUser

README.md

@@ -22,6 +22,16 @@ plugins: [new Visualizer()],
 ```
 This will output a file named `stats.html` in your output directory. You can modify the name/location by passing a `filename` parameter into the constructor.
 
+```javascript
+var Visualizer = require('webpack-visualizer-plugin');
+
+//...
+plugins: [new Visualizer({
+ filename: './statistics.html'
+})],
+//...
+```
+
 ---
 
 ![](https://cloud.githubusercontent.com/assets/1145857/10471320/5b284d60-71da-11e5-8d35-7d1d4c58843a.png)