Update CHANGELOG.md for 8.17.8

[ci skip]

CHANGELOG.md

@@ -2,6 +2,11 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 8.17.8 (2017-08-09)
+
+- Remove hidden symlinks from project import files.
+- Disallow Git URLs that include a username or hostname beginning with a non-alphanumeric character.
+
 ## 8.17.7 (2017-07-19)
 
 - Renders 404 if given project is not readable by the user on Todos dashboard.

changelogs/unreleased/fix-import-symbolink-links.yml

----
-title: Remove hidden symlinks from project import files
-merge_request:
-author:

changelogs/unreleased/rs-alphanumeric-ssh-params.yml

----
-title: Disallow Git URLs that include a username or hostname beginning with a non-alphanumeric
-  character
-merge_request:
-author: