📚 Design: explain priorities and bump dependency one

Sometimes there might be multiple types to choose from. At the moment I'm not sure if
it's best to stick with one type specifier or specify multiple (e.g. new feature that
needs a dependency: ✨📦). I want to be able to identify commits that change dependencies
easily, but splitting them up makes the commit confusing, and using only 📦 is a bit
strange for a commit that adds a new feature.

Author: mbercx

docs/design.md

@@ -143,14 +143,17 @@ Some advantages:
     Although we are in favor of using emojis in the subject line, we do **not** allow emojis in the body.
     This makes it easier to `grep` for commit types.
 
+The list in the table below is in order of priority, e.g. a backwards-incompatible change might improve an existing feature by breaking its API, but should _not_ be typed as an improvement (👌).
+Similarly, if a dependency is changed, it's convenient to quickly spot this, e.g. when updating a conda feedstock.
+
 | Emoji | Meaning                                                          | Similar to [Angular type](https://github.com/angular/angular/blob/22b96b9/CONTRIBUTING.md#-commit-message-guidelines) | In changelog summary?  |
 | ----- | ---------------------------------------------------------------- | ----------------------------------------- | ------------------------- |
 | 💥    | introduce a backward-incompatible (breaking) change / remove deprecated code | `\<type>!` (use `!` + `BREAKING CHANGE:`) | **Yes**                   |
+| 📦    | add, update or change a dependency                                    | `build`                                   | **Yes**                   |
 | ✨    | introduce new features                                           | `feat`                                    | **Yes**                   |
 | 👌    | improve an existing code/feature (no breaking)                   | `perf`/`feat`                             | **Yes**                   |
 | 🐛    | fix a code bug                                                   | `fix`                                     | **Yes**                   |
 | ❌    | mark code as deprecated (note removal version/replacement)       | `refactor`                                | **Yes**                   |
-| 📦    | update or change a dependency                                    | `build`                                   | **Yes**                   |
 | 📚    | add or adapt documentation                                       | `docs`                                    | No                        |
 | 🔄    | refactor existing code with no behavior change                   | `refactor`                                | No                        |
 | 🧪    | add or adapt tests                                               | `test`                                    | No                        |