Minimum version of git noted

CHANGELOG.md

+## gitlab-mirrors v0.3.1
+
+* Updating prerequisite noting minimum git version 1.5.4.  Thanks user grawity@freenode from `#git`.  grawity also mentioned git 1.6.5 for gitlab-mirrors 0.4.x because that's when transport helpers were introduced.
+
+---
 ## gitlab-mirrors v0.3.0
 
 * Certified compatibility with GitLab 6.2.

docs/prerequisites.md

@@ -5,7 +5,7 @@
 * [GitLab 6.x][1]
 * [pyapi-gitlab @ 4d778d7][2]
 * [GNU coreutils][3]
-* [git 1.8.4][4]
+* [git 1.5.4][4] or later (git-svn uses fast-export which was introduced in git 1.5.4)
 
 If you plan on mirroring SVN repositories as well then you'll need the following additional options.
 

lib/VERSION

-VERSION="v0.3.0"
+VERSION="v0.3.1"