Improve BadRequest messages

[Byron]

If the title contains ->, it will be rejected with a reason. However, that reason never shows up, instead you see BadRequest on the commandline.

The --debug output of the command looks like this - it attempted to upload a video with the title: Google.rs #2 [json-tools -> Using IntoIterator]

{
 "error": {
  "errors": [
   {
    "domain": "youtube.video",
    "reason": "invalidTitle",
    "message": "Bad Request",
    "locationType": "other",
    "location": "body.snippet.title"
   }
  ],
  "code": 400,
  "message": "Bad Request"
 }
}

[Byron]

You can watch the development stream on youtube