http://developer.github.com/v3/#user-agent-required

```
dispatch.classic.StatusCode: Unexpected response code: 403
Request forbidden by administrative rules. Please make sure your request has a User-Agent header (http://developer.github.com/v3/#user-agent-required). Check https://developer.github.com for other possible causes.

dispatch.classic.HttpExecutor$$anonfun$1.apply(executor.scala:53)
dispatch.classic.HttpExecutor$$anonfun$1.apply(executor.scala:50)
dispatch.classic.HttpExecutor$$anonfun$x$2.apply(executor.scala:41)
dispatch.classic.HttpExecutor$$anonfun$x$2.apply(executor.scala:36)
dispatch.classic.BlockingHttp$$anonfun$execute$1.apply(Http.scala:54)
dispatch.classic.Http.pack(Http.scala:25)
dispatch.classic.BlockingHttp$class.execute(Http.scala:53)
dispatch.classic.Http.execute(Http.scala:21)
dispatch.classic.HttpExecutor$class.x(executor.scala:36)
dispatch.classic.Http.x(Http.scala:21)
dispatch.classic.HttpExecutor$class.when(executor.scala:50)
```