Update git describe to fix windows support.

Change-Id: If7a2e989cc7b6648bff04dcc47877d77a0ea5ff2
Reviewed-on: http://gerrit.dmdirc.com/2492
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>

ivy.xml

@@ -11,7 +11,7 @@
     <dependencies>
         <dependency org="ant-contrib" name="ant-contrib" rev="1.0b3" conf="build->default" />
         <dependency org="org.sourceforce.ant-nsis" name="ant-nsis" rev="1.3" conf="build->default" />
-        <dependency org="com.github.shanemcc" name="jgit-describe" rev="0.1" conf="build->default" />
+        <dependency org="com.github.shanemcc" name="jgit-describe" rev="0.2" conf="build->default" />
         <dependency org="net.sourceforge.fikin-ant-tasks" name="ant-fikin" rev="1.7.3" conf="build->default" />
 
         <dependency org="org.slf4j" name="slf4j-api" rev="1.6.+" conf="compile->default" />