Merge pull request #609 from JOE1994/0078-abi_stable

abi_stable: Update unsound DrainFilter and RString::retain

crates/abi_stable/RUSTSEC-0000-0000.md

@@ -0,0 +1,17 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "abi_stable"
+date = "2020-12-21"
+url = "https://github.com/rodrimati1992/abi_stable_crates/issues/44"
+categories = ["memory-corruption"]
+
+[versions]
+patched = [">= 0.9.1"]
+```
+
+# 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.