Update CHANGELOG.md for 13.0.5

[ci skip]

CHANGELOG.md

@@ -2,6 +2,20 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 13.0.5 (2020-06-04)
+
+### Fixed (4 changes)
+
+- Fix NoMethodError by using the correct method to report exceptions to Sentry. !33260
+- Fix bug in snippets updating only file_name or content. !33375
+- Fix ambiguous string concatenation on CleanupProjectsWithMissingNamespace. !33497
+- Fix linking alerts to created issues for the Generic alerts intergration. !33647
+
+### Other (1 change)
+
+- Update GitLab Workhorse to v8.31.2. !33818
+
+
 ## 13.0.4 (2020-06-03)
 
 ### Security (1 change)

changelogs/unreleased/219582-fix-ambiguous_string_concat_on_cleanup_projects_with_missing_names.yml

----
-title: Fix ambiguous string concatenation on CleanupProjectsWithMissingNamespace
-merge_request: 33497
-author:
-type: fixed

changelogs/unreleased/fix-invalid-error-tracking-method.yml

----
-title: Fix NoMethodError by using the correct method to report exceptions to Sentry
-merge_request: 33260
-author:
-type: fixed

changelogs/unreleased/fj-fix-single-param-update.yml

----
-title: Fix bug in snippets updating only file_name or content
-merge_request: 33375
-author:
-type: fixed

changelogs/unreleased/pl-alert-management-fix-multiple-issue-creation.yml

----
-title: Fix linking alerts to created issues for the Generic alerts intergration
-merge_request: 33647
-author:
-type: fixed