Release v1.1.1

* BUGFIXES
  * Markdown Sanitation Fix [#1646](https://github.com/go-gitea/gitea/pull/1646)
  * Fix broken hooks [#1376](https://github.com/go-gitea/gitea/pull/1376)
  * Fix migration issue [#1375](https://github.com/go-gitea/gitea/pull/1375)
  * Fix Wiki Issues [#1338](https://github.com/go-gitea/gitea/pull/1338)
  * Forgotten migration for wiki githooks [#1237](https://github.com/go-gitea/gitea/pull/1237)
  * Commit messages can contain pipes [#1218](https://github.com/go-gitea/gitea/pull/1218)
  * Verify external tracker URLs [#1236](https://github.com/go-gitea/gitea/pull/1236)
  * Allow upgrade after downgrade [#1197](https://github.com/go-gitea/gitea/pull/1197)
  * 500 on delete repo with issue [#1195](https://github.com/go-gitea/gitea/pull/1195)
  * INI compat with CrowdIn [#1192](https://github.com/go-gitea/gitea/pull/1192)
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