[//]: # (START/v2.1.0)

* Update `new_client_from_environment()` to support optional token parameter, matching URL parameter behavior. {#88}

* Fix `get_item()` to successfully retrieve items with 26-character titles by adding fallback to title search when ID lookup fails. {#80}

* Updated Slack developer link in documentation. {#130}

* Update override http client timeout env var name in readme. {#105}