Update JGit-describe (properly this time)

Change-Id: I8e8686c0f3498c5b31609d265cfa74263ef034ef
Reviewed-on: http://gerrit.dmdirc.com/2496
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

lib/jgit-describe.jar

@@ -1 +0,0 @@
-/home/greboid/.ivy2/cache/com.github.shanemcc/jgit-describe/jars/jgit-describe-0.2.jar