Prepare for version 0.5.6

Change-Id: Idc9e1bead6096e9164747c1472c94dbbed2a1874
diff --git a/DESCRIPTION b/DESCRIPTION
index b3d1cfd..6b9db48 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: RKorAPClient
 Type: Package
 Title: 'KorAP' Web Service Client Package
-Version: 0.5.5
+Version: 0.5.6
 Authors@R:
     c(person(given = "Marc",
              family = "Kupietz",