Merge branch 'mk-add-security-fixes-to-changelog-10-1-stable' into '10-1-stable'

Add 10.1.2 security fixes to CHANGELOG.md

See merge request gitlab-org/gitlab-ce!15302

CHANGELOG.md

@@ -4,6 +4,8 @@ entry.
 ## 10.1.2 (2017-11-08)
+- [SECURITY] Add X-Content-Type-Options header in API responses to make it more difficult to find other vulnerabilities.
+- [SECURITY] Properly translate IP addresses written in decimal, octal, or other formats in SSRF protections in project imports.
 - [FIXED] Fix TRIGGER checks for MySQL.
 ## 10.1.1 (2017-10-31)