update changelog and ex

Author: dsherret

CHANGELOG.md

@@ -4,6 +4,15 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [0.3.4] - UNRELEASED
+
+### Added
+- `unsupported` opt-in backend [#667]
+
+[#667]: https://github.com/rust-random/getrandom/pull/667
+
+[0.3.4]: https://github.com/rust-random/getrandom/compare/v0.3.3...HEAD
+
 ## [0.3.3] - 2025-05-09
 
 ### Changed

README.md

@@ -207,7 +207,7 @@ unsafe extern "Rust" fn __getrandom_v03_custom(
 ### Unsupported backend
 
 In some rare scenarios you might be compiling this crate in a constrained
-environment (ex. `wasm32-unknown-unknown`), but this crate's functionality
+environment (e.g. `wasm32-unknown-unknown`), but this crate's functionality
 is not actually used by your code. If you are confident that `getrandom` is
 not used in your project, but it gets pulled nevertheless by one of your
 dependencies, then you can enable the `unsupported` backend, which always