Add version for Xous

README.md

@@ -72,7 +72,7 @@ The minimum supported Rust toolchain version depends on the platform:
     <tr>
         <td>Xous</td>
         <td><code>*-*-xous-*</code></td>
-        <td>unstable</td>
+        <td>1.74 ([rust-lang/rust#104101])</td>
     </tr>
 </table>
 
@@ -100,4 +100,5 @@ in this crate, as defined in [LICENSE-APACHE], shall be licensed according to
 [slice]: https://doc.rust-lang.org/std/primitive.slice.html
 [`OsStr`]: https://doc.rust-lang.org/std/ffi/struct.OsStr.html
 [`OsString`]: https://doc.rust-lang.org/std/ffi/struct.OsString.html
+[rust-lang/rust#104101]: https://github.com/rust-lang/rust/pull/104101
 [`Vec<u8>`]: https://doc.rust-lang.org/std/vec/struct.Vec.html