Mark library as deprecated

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Author: yurishkuro

README.md

@@ -1,4 +1,6 @@
-# 🛑 This library is being deprecated!
+# 🛑 This library is DEPRECATED!
+
+No new pull requests are accepted except for security fixes.
 
 We urge all users to migrate to [OpenTelemetry](https://opentelemetry.io/). Please refer to the [notice in the documentation](https://www.jaegertracing.io/docs/latest/client-libraries/#deprecating-jaeger-clients) for details.