increase update_id by 1 to skip bad server response #1651
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A possible fix for #1609.
We actually should not ignore unicode decode error or json decode error in order to make it work, my solution is to increase last_update_id by 1 until that bad update is skipped.
This may cause the bot to lose some of its updates, which is a little bit of a problem. However this is way better than looping and throwing exceptions endlessly.