Update README.md

docs/README.md

@@ -14,12 +14,15 @@ The latest Rough.js release (beta version 0.1): [Download](./rough.zip)
 ## Setup
 Initialize a **RoughCanvas** object by passing in the canvas node and the size of the canvas. 
 Following code snippet draws a rectangle.
-```
+```html
 <script src="dist/rough.min.js"></script>
 <canvas id="myCanvas"></canvas>
+```
+```javascript
 var rough = new RoughCanvas(document.getElementById('myCanvas'), 500, 500);
 rough.rectangle(10, 10, 200, 200);
 ```
+
 ## Drawing lines and shapes
 
 ### Filling