Update CHANGELOG.md for 11.9.8

[ci skip]
2019-04-11 17:02:43 +00:00 · 2019-04-11 17:02:43 +00:00 · dc8848794b
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 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.

+## 11.9.8 (2019-04-11)
+
+### Deprecated (1 change)
+
+- Allow to use untrusted Regexp via feature flag. !26905
+
+### Performance (2 changes)
+
+- Improve performance of PR import. !27121
+- Disable method instrumentation for diffs. !27235
+
+### Other (1 change)
+
+- Restore HipChat project service. !27172
+
+
 ## 11.9.7 (2019-04-09)

 - No changes.
--- a/changelogs/unreleased/allow-to-use-untrusted-ruby-syntax.yml
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---
-title: Allow to use untrusted Regexp via feature flag
-merge_request: 26905
-author:
-type: deprecated
--- a/changelogs/unreleased/fix-pull-request-importer.yml
+++ b/changelogs/unreleased/fix-pull-request-importer.yml
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---
-title: Improve performance of PR import
-merge_request: 27121
-author:
-type: performance
--- a/changelogs/unreleased/restore-hipchat.yml
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---
-title: Restore HipChat project service
-merge_request: 27172
-author:
-type: change
--- a/changelogs/unreleased/sh-disable-diff-instrumentation.yml
+++ b/changelogs/unreleased/sh-disable-diff-instrumentation.yml
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---
-title: Disable method instrumentation for diffs
-merge_request: 27235
-author:
-type: performance