Update CHANGELOG.md for 12.0.3

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 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 12.0.3 (2019-06-27)
+
+### Security (10 changes)
+
+- Persist tmp snippet uploads at users.
+- Gate MR head_pipeline behind read_pipeline ability.
+- Fix DoS vulnerability in color validation regex.
+- Expose merge requests count based on user access.
+- Fix Denial of Service for comments when rendering issues/MR comments.
+- Add missing authorizations in GraphQL.
+- Disable Rails SQL query cache when applying service templates.
+- Prevent Billion Laughs attack.
+- Correctly check permissions when creating snippet notes.
+- Prevent the detection of merge request templates by unauthorized users.
+
+
 ## 12.0.2 (2019-06-25)
 
 ### Fixed (7 changes, 1 of them is from the community)