RELEASES.md: document 1.16 lifetime elision change

Closes rust-lang#41105.

RELEASES.md

@@ -898,6 +898,9 @@ Compatibility Notes
 * [Ctrl-Z returns from `Stdin.read()` when reading from the console on
   Windows][38274]
 * [Clean up semantics of `self` in an import list][38313]
+* Reimplemented lifetime elision. This change was almost entirely compatible
+  with existing code, but it did close a number of small bugs and loopholes,
+  as well as being more accepting in some other [cases][41105].
 
 [37057]: https://github.com/rust-lang/rust/pull/37057
 [37761]: https://github.com/rust-lang/rust/pull/37761
@@ -932,6 +935,7 @@ Compatibility Notes
 [39048]: https://github.com/rust-lang/rust/pull/39048
 [39282]: https://github.com/rust-lang/rust/pull/39282
 [39379]: https://github.com/rust-lang/rust/pull/39379
+[41105]: https://github.com/rust-lang/rust/issues/41105
 [`<*const T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
 [`<*mut T>::wrapping_offset`]: https://doc.rust-lang.org/std/primitive.pointer.html#method.wrapping_offset
 [`Duration::checked_add`]: https://doc.rust-lang.org/std/time/struct.Duration.html#method.checked_add