Update pre release notes for 1.0.3

Author: Nicolas Rodriguez

Diff for: _posts/releases/2015-03-31-release-1.0.3.md

@@ -25,6 +25,7 @@ download_tar: https://github.com/jbox-web/redmine_git_hosting/archive/1.0.3.tar.
 * Remove useless ```:gitolite_log_split``` params
 * Improve GitCache lookup performance (for Database and Redis adapters)
 * Improve Statistics rendering performance
+* Test the plugin with Redmine latest stable branch to prevent/anticipate [this kind of bug](https://github.com/jbox-web/redmine_git_hosting/issues/387)
 * Bump to ZeroClipboard 2.2.0
 * Bump to HighChart 4.1.4