Add latest changes from gitlab-org/gitlab@12-7-stable-ee

CHANGELOG-EE.md

 Please view this file on the master branch, on stable branches it's out of date.
 
+## 12.7.8 (2020-03-26)
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+### Security (1 change)
+
+- Add NPM package versions SemVer validation.
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+
 ## 12.7.7
 
 ### Security (5 changes)