v2.3.0

What's Changed

• Update README.md by @EvilOlaf in #36
• address a few shellcheck complains by @EvilOlaf in #37
• add fancy banner at startup by @EvilOlaf in #38
• minor readme fixes by @EvilOlaf in #39
• use existing shutdown function by @EvilOlaf in #40
• watchdog: adjust wording by @EvilOlaf in #41
• watchdog: add debug message and show memory usage at startup by @EvilOlaf in #42
• documentation: add MEMORY_WATCHDOG_DEBUG by @EvilOlaf in #43
• documentation: mention possible update error by @EvilOlaf in #44

Full Changelog: v2.2.0...v2.3