Add ascii advisory (#1618)

* Add ascii advisory

* Strip unnecessary comments

* Fix version range specification and category

* Change fixed version specification to `>= 0.9.3`

---------

Co-authored-by: Sergey "Shnatsel" Davidoff <shnatsel@gmail.com>

crates/ascii/RUSTSEC-0000-0000.md

@@ -0,0 +1,19 @@
+```toml
+[advisory]
+id = "RUSTSEC-0000-0000"
+package = "ascii"
+date = "2023-02-25"
+url = "https://github.com/tomprogrammer/rust-ascii/issues/64"
+informational = "unsound"
+categories = ["memory-corruption"]
+keywords = ["ascii"]
+[versions]
+patched = [">= 0.9.3"]
+unaffected = ["<= 0.6.0"]
+```
+
+# Ascii allows out-of-bounds array indexing in safe code
+
+Affected version of this crate had implementation of `From<&mut AsciiStr>` for `&mut [u8]` and `&mut str`. This can result in out-of-bounds array indexing in safe code.
+
+The flaw was corrected in commit [8a6c779](https://github.com/tomprogrammer/rust-ascii/pull/63/commits/8a6c7798c202766bd57d70fb8d12739dd68fb9dc) by removing those impls.