Fix broken async httpclient example

As the async httpclient is almost certainly the first async example beginners will want to try, we OWE it to them to give them a real example.

Example repeated here for clarity:

```nim
import asyncdispatch, httpclient

proc asyncProc(): Future[string] {.async.} =
  var client = newAsyncHttpClient()
  return await client.getContent("http://example.com")

echo waitFor asyncProc()
```

This is my first Nim contribution, please let me know if the code is right. (it runs on my machine, but may not be the best example)

0 files changed, 0 insertions, 0 deletions