planned breaking changes

README.md

@@ -2,6 +2,10 @@
 
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+## ❗ Planned breaking changes
+
+I will rename “ghcups” to “**ghcman**” in a half years on November 2021 ([discussion](https://github.com/kakkun61/ghcups/discussions/16)).
+
 ## Dependency
 
 This depends on the [7-Zip](https://sourceforge.net/projects/sevenzip/files/7-Zip/). You must add the _7z_ to the `$Env:Path`.