Start tidyverse migration

Change-Id: Ifc972de789c22e2ff43159740d7f1fa7125e1ef2
diff --git a/DESCRIPTION b/DESCRIPTION
index 561a849..962840c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -12,6 +12,11 @@
 RoxygenNote: 6.1.1
 Imports:
     R.cache,
+    magrittr,
+    tidyr,
+    dplyr,
+    purrr,
+    lubridate,
     curl,
     jsonlite,
     utils,
@@ -21,3 +26,4 @@
     'KorAPConnection.R'
     'KorAPCorpusStats.R'
     'KorAPQuery.R'
+    'reexports.R'