Link to announcement blog post and migration guide in changelogs.

Author: Dirbaio

embedded-hal-async/CHANGELOG.md

@@ -11,6 +11,8 @@ No unreleased changes yet.
 
 ## [v1.0.0] - 2023-12-28
 
+Check out the [announcement blog post](https://blog.rust-embedded.org/embedded-hal-v1/) and the [migration guide](../docs/migrating-from-0.2-to-1.0.md) for help with migrating from v0.2 to v1.0.
+
 - Updated `embedded-hal` to version `1.0.0`.
 
 ## [v1.0.0-rc.3] - 2023-12-14

embedded-hal-nb/CHANGELOG.md

@@ -11,6 +11,8 @@ No unreleased changes
 
 ## [v1.0.0] - 2023-12-28
 
+CheckCheck out the [announcement blog post](https://blog.rust-embedded.org/embedded-hal-v1/) and the [migration guide](../docs/migrating-from-0.2-to-1.0.md) for help with migrating from v0.2 to v1.0.
+
 - Updated `embedded-hal` to version `1.0.0`.
 
 ## [v1.0.0-rc.3] - 2023-12-14

embedded-hal/CHANGELOG.md

@@ -11,6 +11,8 @@ No unreleased changes yet.
 
 ## [v1.0.0] - 2023-12-28
 
+Check out the [announcement blog post](https://blog.rust-embedded.org/embedded-hal-v1/) and the [migration guide](../docs/migrating-from-0.2-to-1.0.md) for help with migrating from v0.2 to v1.0.
+
 - gpio: remove `ToggleableOutputPin`, move `toggle()` to `StatefulOutputPin`.
 
 ## [v1.0.0-rc.3] - 2023-12-14