RUSTSEC-2020-0105: abi_stable: Update unsound DrainFilter and RString::retain


Affected versions of this crate contained code from the Rust standard library that contained soundness bugs rust-lang/rust#60977 (double drop) & rust-lang/rust#78498 (create invalid utf-8 string).

The flaw was corrected in v0.9.1 by making a similar fix to the one made in the Rust standard library.

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Patched Versions