Update git describe to fix windows support.

Change-Id: I829fecb5bcea76c6a584fc99090e1ffaba4cf99f
Reviewed-on: http://gerrit.dmdirc.com/2495
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

lib/jgit-describe.jar

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