Update CHANGELOG-EE.md for 12.8.7-ee

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CHANGELOG-EE.md

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+## 12.8.7 (2020-03-16)
+
+### Fixed (1 change)
+
+- Allow multipart uploads for packages. !26387
+
+
 ## 12.8.6 (2020-03-11)
 
 - No changes.

ee/changelogs/unreleased/208744-fix-nuget-uploads-without-object-storage.yml

----
-title: Allow multipart uploads for packages
-merge_request: 26387
-author:
-type: fixed