Add new release notes for v0.56.0

release notes/v0.56.0.md

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+k6 `v0.56.0` is here 🎉! This release includes:
+
+- (_optional_) `<highlight of breaking changes>`
+- `<Summary of new features>` (_one or multiple bullets_)
+
+
+## Breaking changes
+
+- `#pr`, `<small_break_1>`
+- `#pr`, `<small_break_2>`
+
+### (_optional h3_) `<big_breaking_change>` `#pr`
+
+## New features
+
+_optional intro here_
+
+### `<big_feature_1>` `#pr`
+
+_what, why, and what this means for the user_
+
+### `<big_feature_n>` `#pr`
+
+_what, why, and what this means for the user_
+
+## UX improvements and enhancements
+
+_Format as `<number> <present_verb> <object>. <credit>`_:
+
+- _`#999` Gives terminal output prettier printing. Thanks to `@person` for the help!_
+- `#pr` `<description>`
+- `#pr` `<description>`
+
+## Bug fixes
+
+_Format as `<number> <present_verb> <object>. <credit>`_:
+- _`#111` fixes race condition in runtime_
+
+## Maintenance and internal improvements
+
+_Format as `<number> <present_verb> <object>. <credit>`_:
+- _`#2770` Refactors parts of the JS module._
+
+## _Optional_ Roadmap
+
+_Discussion of future plans_
+