Fix Unsound Send/Sync bound for Device and DeviceHandle #45
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As mention #44 UsbContext trait has neither Send nor Sync bound and can be implemented from the user side. This permits writing a custom non-thread safe UsbContext implementation in safe Rust code, which can cause a data race when used with Device or DeviceHandle. So required UsbContext implement Send + Sync
a1ien
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As mention #44 UsbContext trait has neither Send nor Sync bound and can be implemented from the user side. This permits writing a custom non-thread safe UsbContext implementation in safe Rust code, which can cause a data race when used with Device or DeviceHandle.
So required UsbContext implement Send + Sync
Fix #44