Update: Deprecating Personal Config (#32)

designs/2019-deprecating-personal-config/README.md

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+-   Start Date: 2019-07-16
+-   RFC PR: https://github.com/eslint/rfcs/pull/32
+-   Authors: Toru Nagashima ([@mysticatea](https://github.com/mysticatea))
+
+# Deprecating Personal Config
+
+## Summary
+
+This RFC deprecates the personal config that is `.eslintrc` files on home directory.
+
+## Motivation
+
+Since 6.0.0, ESLint doesn't load plugins/configs/parsers from the global installation even if it's not a part of a project such as the personal config. This is inconvenient for the personal config. But, in #28 discussion, we confirm that we don't want to use the global installation.
+
+We don't recommend to use global-installed ESLint. But the personal config has encouraged to use it.
+
+## Detailed Design
+
+Three steps:
+
+1. **Soft deprecation**: Update our documentation to announce to deprecate the personal config on the next minor release.
+2. **Hard deprecation**: Add the deprecation warning of the personal config on ESLint 7.0.0.
+    - ESLint shows a warning when it loaded the personal config.
+    - ESLint shows a warning when it ignored the personal config (Currently, it ignores `.eslintrc` files on home directory if a project directory is in home directory and the project has `.eslintrc` files.)
+3. **Removal**: Remove the personal config functionality on ESLint 8.0.0.
+    - ESLint no longer loads the personal config even if the project config was not found.
+    - ESLint no longer ignores the config files on home directory even if the project config was found.
+
+## Documentation
+
+-   Remove the personal config from [Configuring ESLint](https://eslint.org/docs/user-guide/configuring) page.
+-   Announce on the release notes.
+
+## Drawbacks
+
+It will make people inconvenient to lint standalone files.
+
+## Backwards Compatibility Analysis
+
+Yes, this is a breaking change.
+
+To lint standalone files, people have to have a dummy project directory such as `sandbox`.
+
+## Alternatives
+
+-   https://github.com/eslint/rfcs/pull/28
+
+## Related Discussions
+
+-   https://github.com/eslint/rfcs/pull/7
+-   https://github.com/eslint/rfcs/pull/28
+-   https://github.com/eslint/eslint/issues/11914