v2.1.4

Added

• Session are deleted automatically when a chat user fails to authenticate against St2 API.
• Include Slack users "display name" in session list for easier identification.

Changed

• Update documentation with corrections and improved examples.
• Corrected error of dynamic commands not registering correctly when the plugin was deactivated/activated.
• Improved robustness of version check code to gracefully handle github.com being unavailable.