Update CHANGELOG.md for 8.17.3

[ci skip]

Former-commit-id: d1c313b2

CHANGELOG.md

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 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
+## 8.17.3 (2017-03-07)
+
+- Fix the redirect to custom home page URL. !9518
+- Fix broken migration when upgrading straight to 8.17.1. !9613
+- Make projects dropdown only show projects you are a member of. !9614
+- Fix creating a file in an empty repo using the API. !9632
+- Don't copy tooltip when copying GFM.
+- Fix cherry-picking or reverting through an MR.
+
 ## 8.17.2 (2017-03-01)
 - Expire all webpack assets after 8.17.1 included a badly compiled asset. !9602

changelogs/unreleased/28609-fix-redirect-to-home-page-url.yml

----
-title: Fix the redirect to custom home page URL
-merge_request: 9518
-author:

changelogs/unreleased/28850-fix-broken-migration.yml

----
-title: Fix broken migration when upgrading straight to 8.17.1
-merge_request: 9613
-author:

changelogs/unreleased/dm-dont-copy-toolip.yml

----
-title: Don't copy tooltip when copying GFM
-merge_request:
-author:

changelogs/unreleased/dm-fix-api-create-file-on-empty-repo.yml

----
-title: Fix creating a file in an empty repo using the API
-merge_request: 9632
-author:

changelogs/unreleased/dm-fix-cherry-pick.yml

----
-title: Fix cherry-picking or reverting through an MR
-merge_request:
-author:

changelogs/unreleased/use-v3-api-on-frontend.yml

----
-title: Make projects dropdown only show projects you are a member of
-merge_request: 9614
-author: