Fix deadlock when calling Dispose from the UI thread. #45
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Basically, if you call Dsipose from the UI thread, or any other thread that has a synchronization context, it blocks and waits for the Send to complete. But then _httpClient.SendAsync tries to complete in the original context, but it can't because it's already blocked. Since there's no timeout, it gets deadlocked forever.
Adding the ConfigureAwait(false) causes the _httpClient request to be completed in the thread pool instead, avoiding the deadlock.