Change 1.5.0 RC1 release date in changelog

Signed-off-by: Lauris Bukšis-Haberkorns <[email protected]>

Author: lafriks

CHANGELOG.md

@@ -4,7 +4,7 @@ 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).
 
-## [1.5.0-RC1](https://github.com/go-gitea/gitea/releases/tag/v1.5.0-rc1) - 2018-07-03
+## [1.5.0-RC1](https://github.com/go-gitea/gitea/releases/tag/v1.5.0-rc1) - 2018-07-04
 * SECURITY
   * Limit uploaded avatar image-size to 4096x3072 by default (#4353)
   * Do not allow to reuse TOTP passcode (#3878)