📝 Announce deprecation of the master branch

From now on, the default repository branch is `unstable/v1`. Resolves #83
pypa · Jul 25, 2022 · 1bbe3c9 · 1bbe3c9
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@@ -8,6 +8,13 @@ This text suggests a minimalistic usage overview. For more detailed
 walkthrough check out the [PyPA guide].
 
 
+## 🌇 `master` branch sunset ❗
+
+The `master` branch version has been sunset. Please, change the GitHub
+Action version you use from `master` to `release/v1` or use an exact
+tag, or a full Git commit SHA.
+
+
 ## Usage
 
 To use the action add the following step to your workflow file (e.g.