Prepare for 0.9.0

Change-Id: Ibf9b5279eed4a7a92299d57dd917558796577df2
diff --git a/DESCRIPTION b/DESCRIPTION
index 1dac084..9515a94 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: RKorAPClient
 Type: Package
 Title: 'KorAP' Web Service Client Package
-Version: 0.8.1.9000
+Version: 0.9.0
 Authors@R:
     c(person(given = "Marc",
              family = "Kupietz",