Deprecation warning

Author: philsturgeon

README.md

@@ -1,17 +1,12 @@
 Swagger/OpenAPI CLI
 ============================
 
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+> ⚠️ Swagger CLI has been deprecated, due to the maintenance burnden of trying to keep up with expectations of a huge userbase with little to no pull requests or support. [Redocly CLI](https://redocly.com/redocly-cli/) covers all of the same functionality, and has more advanced linting with custom rules, and we highly recommend using that instead. They have conveniently provided a [migration guide](https://redocly.com/docs/cli/guides/migrate-from-swagger-cli/) for existing Swagger CLI users. Read the review of [Redocly CLI from APIs You Won't Hate](https://apisyouwonthate.com/blog/redocly-cli/).
 
 Features
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