Update package description

README.md

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 # basictracer-go
-The Go incarnation of the cross-platform "BasicTracer" reference implementation for OpenTracing.
 
-## Status
-
-In early development: there will be backwards-incompatible changes so _caveat emptor_ for now!
+Basic implementation of the OpenTracing API for Go. Sometimes this package is called "reference implementation",
+but it is not meant as a production quality library. For real production implementations, search the OpenTracing
+Registry (https://opentracing.io/registry/?s=go) for packages with the tag "tracer".
 
 ## Licensing
 
-[Apache 2.0 License](./LICENSE).
+[Apache 2.0 License](./LICENSE).