v2.3.0

• Implemented a new method for determining message freshness that does not rely on dates [#35]
• Added support for communicating with telegram-cli through a unix socket (contributed by @tmmsartor) [#56]
• Support for more event types in HTML and plaintext formatters [#49,#50]
• Fixed a problem where some user ids do not appear in the PISG usermap in certain situations
• Fixed a problem that could cause full formatting memory usage even if all formatters are disabled [#57]