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This release fixes potential database connectivity issues (H2) and makes all check timings configurable. In addition, the map CAPTCHA can now be displayed in the offhand for more variety. Some dependencies have also been updated.
Full Changelog

Sonar is a lightweight, effective and easy-to-use antibot plugin for Velocity, BungeeCord, and Bukkit. Sonar provides a multi-layered defense against bots, keeping your server safe from common and even sophisticated bot attacks.