Update CHANGELOG.md for 11.3.12

[ci skip]
2018-12-06 00:43:03 +00:00 · 2018-12-06 00:43:03 +00:00 · d41d1b0f12
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 - Check frozen string in style builds. (gfyoung)


+## 11.3.12 (2018-12-06)
+
+### Security (1 change)
+
+- Prevent a path traversal attack on global file templates.
+
+
 ## 11.3.11 (2018-11-26)

 ### Security (33 changes)