Update README docs

Author: luke-hill

README.md

@@ -31,20 +31,32 @@ Each message in a message stream is of type [Envelope](messages.md#envelope).
 
 Each subdirectory defines language-specific implementations of these messages,
 generated from the JSON schemas. The current implementations are:
-- C++
+
+### Languages automatically released for every version
+
+The release process for the below languages uses [polyglot-release](./RELEASING.md)
+
 - .NET
-- Go
 - Java
 - Javascript
 - Perl
 - PHP
+- Python
 - Ruby
 
-There is also 1 subdirectory for Elixir which contains the legacy implementation which was largely
-driven by protobuf. This is currently not implemented or tested / integrated into our CI and will
-require the process of porting over to the JSON schema protocol.
+### Go
+
+The Go implementation is also cut for every version but is just maintained as a GitHub tag
+
+### C++
+
+This is currently tested but not automatically released. We are seeking help for this implementation
+
+### Elixir
 
-- Elixir
+There is also a subdirectory for Elixir which contains the legacy implementation which was largely
+driven by protobuf. This has recently been re-integrated into our CI and will be ported over to
+the JSON schema protocol in due course, for now it remains written in protobuf
 
 ## Message emitters
 Cucumber Messages are currently sent by the following versions of Cucumber (using the `message` formatter):