RUSTSEC-2020-0124 on 2020-12-08: ArcGuard's Send and Sync should have bounds on RC

Affected versions of this crate implement Send/Sync for ArcGuard<RC, T> with no trait bounds on RC. This allows users to send RC: !Send to other threads and also allows users to concurrently access Rc: !Sync from multiple threads.

This can result in memory corruption from data race or other undefined behavior caused by sending T: !Send to other threads (e.g. dropping MutexGuard<T> in another thread that didn't lock its mutex).

CVE-2020-36444

GHSA-9j8q-m9x5-9g6j

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