Update readme

Author: bilfeldt

CHANGELOG.md

@@ -29,6 +29,8 @@ The following environment variables have been renamed:
 - `HTTP_CLIENT_LOGGER_FILTERING_4XX` is renamed to `HTTP_CLIENT_LOGGER_FILTER_4XX`
 - `HTTP_CLIENT_LOGGER_FILTERING_5XX` is renamed to `HTTP_CLIENT_LOGGER_FILTER_5XX`
 - `HTTP_CLIENT_LOGGER_FILTERING_SLOW` is renamed to `HTTP_CLIENT_LOGGER_FILTER_SLOW`
+- `HTTP_CLIENT_LOGGER_CHANNEL_LOG_ENABLED` removed in favor of `HTTP_CLIENT_LOGGER_CHANNEL`
+- `HTTP_CLIENT_LOGGER_DISK_LOG_ENABLED` removed in favor of `HTTP_CLIENT_LOGGER_DISK`
 
 ### 0.2.0 => 0.3.0