Bump version to dev version 0.9.0.9000

Change-Id: Idd6f0e331e90a2d4fc2115657e98e726b00f0f08
diff --git a/DESCRIPTION b/DESCRIPTION
index 9515a94..cce9334 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: RKorAPClient
 Type: Package
 Title: 'KorAP' Web Service Client Package
-Version: 0.9.0
+Version: 0.9.0.9000
 Authors@R:
     c(person(given = "Marc",
              family = "Kupietz",