Backport 1.4.3 changelog to master branch (#4323)

CHANGELOG.md

@@ -4,6 +4,18 @@ This changelog goes through all the changes that have been made in each release
 without substantial changes to our git log; to see the highlights of what has
 been added to each release, please refer to the [blog](https://blog.gitea.io).
 
+## [1.4.3](https://github.com/go-gitea/gitea/releases/tag/v1.4.3) - 2018-06-26
+* SECURITY
+  * HTML-escape plain-text READMEs (#4192) (#4214)
+  * Fix open redirect vulnerability on login screen (#4312) (#4312)
+* BUGFIXES
+  * Fix broken monitoring page when running processes are shown (#4203) (#4208)
+  * Fix delete comment bug (#4216) (#4228)
+  * Delete reactions added to issues and comments when deleting repository (#4232) (#4237)
+  * Fix wiki URL encoding bug (#4091) (#4254)
+  * Fix code tab link when viewing tags (#3908) (#4263)
+  * Fix webhook type conflation (#4285) (#4285)
+
 ## [1.4.2](https://github.com/go-gitea/gitea/releases/tag/v1.4.2) - 2018-06-04
 * BUGFIXES
   * Adjust z-index for floating labels (#3939) (#3950)