Execution continues even in an error state

[VxJasonxV]

I've written a few simple scripts against this gem, and noticed some false positives where the script continues to execute even with an failure API return. It seems that if the API doesn't return at all (HTTP Timeout) then the script halts execution, but if it returns with a 503, it continues:

{
    :body => {
         "cache-control" => [
            [0] "no-cache"
        ],
          "content-type" => [
            [0] "text/html"
        ],
                  "date" => [
        ],
            [0] "Thu, 24 Mar 2016 20:44:26 GMT"
        ],
                "server" => [
            [0] "nginx"
        "content-length" => [
            [0] "107"
        ],
            "connection" => [
            [0] "Close"
        ]
    }
    :response => 503
},

Non-OK HTTP returns should raise a rescue'able error, and halt execution.

[djhopper01]

@VxJasonxV I started working on this here: https://github.com/djhopper01/twitch-rb/commit/1a07fb5770ba5dfe1a976f4b77664a07f0a6bf55. Once I add a spec for it, I'll open up a PR.