Add the correct url in the changelog
Unreleased changes are available as `avenga/couper:edge` container.
* **Added**
- * Register `default` function as `coalesce` alias ([#345](https://github.com/avenga/couper/issues/345))
+ * Register `default` function as `coalesce` alias ([#356](https://github.com/avenga/couper/pull/356))
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