chore: Use ControlFlow in checkpoints. (#602)

chore: Use ControlFlow in checkpoints. `checkpoint` and `async_checkpoint` now `use std::ops::ControlFlow instead` of the `Step` enum. ControlFlow has two variants, `Continue` and `Break`
apollographql · Mar 9, 2022 · 6cfdb04 · 6cfdb04
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -19,7 +19,13 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
   Description! And a link to a [reference](http://url)
 
  -->
+
 # [x.x.x] (unreleased) - 2021-mm-dd
+
+ - **❗ BREAKING ❗**
+ -  **use ControlFlow in checkpoints** ([PR #602](https://github.com/apollographql/router/pull/602))
+   `checkpoint` and `async_checkpoint` now `use std::ops::ControlFlow instead` of the `Step` enum. ControlFlow has two variants, `Continue` and `Break`.
+
 ## ❗ BREAKING ❗
 - **Header propagation plugin** ([PR #599](https://github.com/apollographql/router/pull/599))