Remove questionable unsafe impl Send
#869
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`HistoryCompleter` is not `Send` due to it containing a reference to a `&dyn History` which was only `trait History: Send`. Here the property of a type T needing to implement `Sync` for its `&T` to be `Send` comes into play. Thus this `unsafe impl Send` is unsound. The change of making `trait History: Send + Sync` makes `HistoryCompleter: Send` automatically and should be compatible for all sound implementations.
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HistoryCompleteris notSenddue to it containing a reference to a&dyn Historywhich was onlytrait History: Send.Here the property of a type T needing to implement
Syncfor its&Tto beSendcomes into play. Thus thisunsafe impl Sendis unsound.The change of making
trait History: Send + SyncmakesHistoryCompleter: Sendautomatically and should be compatible for all sound implementations.