Update CHANGELOG.md

Author: flash-gordon

CHANGELOG.md

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+## 3.6.4 2024-07-01
+
+
+### Fixed
+
+- Excessive logging when same gateway is shared between multiple containers (@flash-gordon)
+- Warning about using color option from active-support log subscriber (@flash-gordon + @bendangelo)
+
+
+[Compare v3.6.3...v3.6.4](https://github.com/rom-rb/rom-sql/compare/v3.6.3...v3.6.4)
+
 ## 3.6.3 2024-05-06