chore: prepare changelog [skip ci]

CHANGELOG.md

@@ -4,7 +4,7 @@
 	## __WORK IN PROGRESS__
 -->
 
-## 6.0.0-alpha.2 (2021-01-02)
+## __WORK IN PROGRESS__
 ### Breaking changes · [Migration guide](https://zwave-js.github.io/node-zwave-js/#/getting-started/migrating-to-v6)
 * Logging can now be configured through driver options. However, the environment variables for logging are no longer evaluated lazily, so they now need to be set before requiring `zwave-js`.
 * The second (string) parameter of the `"interview failed"` event handler was removed