Update CHANGELOG-EE.md for 13.1.2-ee

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CHANGELOG-EE.md

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+## 13.1.2 (2020-07-01)
+
+### Security (2 changes)
+
+- Fixed pypi package API XSS.
+- Fix project authorizations for instance security dashboard.
+
+
 ## 13.1.1 (2020-06-23)
 - No changes.

ee/changelogs/unreleased/security-215640-pypi.yml

----
-title: Fixed pypi package API XSS
-merge_request:
-author:
-type: security

ee/changelogs/unreleased/security-fix_project_authorizations_for_security_dashboard.yml

----
-title: Fix project authorizations for instance security dashboard
-merge_request:
-author:
-type: security