Fix wrong parameter in changelog

Author: SpaceK33z

CHANGELOG.md

@@ -7,7 +7,7 @@
 - **Breaking change:** removed `contentBase` as a proxy feature (deprecated since 1.x).
 - Limit websocket retries when the server can't be reached ([#589](https://github.com/webpack/webpack-dev-server/issues/589)).
 - Improve detection for getting the server URL in the client ([#496](https://github.com/webpack/webpack-dev-server/issues/496)).
-- Add `clientLogLevel` (`--clientLogLevel` for CLI) option. It controls the log messages shown in the browser. Available levels are `error`, `warning`, `info` or `none` ([#579](https://github.com/webpack/webpack-dev-server/issues/579)).
+- Add `clientLogLevel` (`--client-log-level` for CLI) option. It controls the log messages shown in the browser. Available levels are `error`, `warning`, `info` or `none` ([#579](https://github.com/webpack/webpack-dev-server/issues/579)).
 - Allow using no content base with the `--no-content-base` flag (previously it always defaulted to the working directory).
 - Use stronger certs for the `https` modus, to prevent browsers from complaining about it ([#572](https://github.com/webpack/webpack-dev-server/issues/572)).