Added release notes for 12.3

Author: anitaa1990

CHANGELOG.md

@@ -1,6 +1,9 @@
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 Contains editorialized release notes. Raw release notes should go into `RELEASE-NOTES.txt`.
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+## 12.3
+For this release, we focused on taking care of minor bugs that our team found. Don’t be fooled – we are working on some pretty cool stuff for you all! Keep your feedback rolling in; it helps us figure out what to work on next.
+
 ## 12.2
 We’ve made a few enhancements to manage your business. It’s now easier to set up your store when logging in. Adding attributes from the app just became a whole lot easier! Keep your feedback coming!