Update README.md (#1368)

Fix graph.cool link in example

examples/with-apollo/README.md

@@ -31,4 +31,4 @@ In this simple example, we integrate Apollo seamlessly with Next by wrapping our
 
 On initial page load, while on the server and inside `getInitialProps`, we invoke the Apollo method,  [`getDataFromTree`](http://dev.apollodata.com/react/server-side-rendering.html#getDataFromTree). This method returns a promise; at the point in which the promise resolves, our Apollo Client store is completely initialized.
 
-This example relies on [graph.cool](graph.cool) for its GraphQL backend.
+This example relies on [graph.cool](https://www.graph.cool) for its GraphQL backend.