Update CHANGELOG.md

CHANGELOG.md

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+# Version 1.2.0-rc.1 Release Notes
+
+This is the first release candidate for version 1.2.0.
+
+## Highlight
+
+- Added support for **998DR** Petrainer RF protocol.
+
+## Major Updates
+
+- Add command to get/set api domain.
+- Add command to get/set/clear override for Live Control Gateway (LCG) domain.
+
+## Minor Updates
+
+- Change transmission end command to last for 300 ms.
+- Increase WDT timeout during OTA updates to prevent watchdog resets.
+- Remove non thread-safe RF sequence caching.
+- Update flatbuffers to 23.5.26.
+- Start utilizing StringView more to reduce memory and CPU usage.
+- Small code cleanup and refactoring.
+
 # Version 1.1.2 Release Notes
 
 - Add support for OpenShock Core V2 Hardware