Prepare release notes for v0.6.0 (#75)

RELEASE_NOTES.md

@@ -2,13 +2,13 @@
 
 ## Summary
 
-<!-- Here goes a general summary of what this release is about -->
+This version removes `grpclib` support and adds new SSL options to the connection URI.
 
 ## Upgrading
 
 - `grpclib` was removed, if you used `grpclib` you should switch to `grpcio` instead.
 
-  You should also update your dependency to `frequenz-client-base` (without any `[grpclib]` or `[grpcio]` suffix).
+  You should also update your dependency to `frequenz-client-base` (without any `[grpclib]` or `[grpcio]` suffix). Also, now there is no need to pass around the channel type to the `BaseApiClient` or the `parse_grpc_uri` function.
 
 - The `parse_grpc_uri` function (and `BaseApiClient` constructor) now enables SSL by default (`ssl=false` should be passed to disable it).
 
@@ -21,7 +21,3 @@
   * `ssl_root_certificates_path` to specify the path to the root certificates file.
   * `ssl_private_key_path` to specify the path to the private key file.
   * `ssl_certificate_chain_path` to specify the path to the certificate chain file.
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->