Add ci function

The ci function adds confidence interval and
relative frequencies to a table.

Change-Id: Id702522d35e557f20540bc24301195d0513b7138
diff --git a/DESCRIPTION b/DESCRIPTION
index 276c531..506ee08 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -12,6 +12,9 @@
 RoxygenNote: 6.1.1
 Imports:
     R.cache,
+    broom,
+    ggplot2,
+    tibble,
     magrittr,
     tidyr,
     dplyr,
@@ -27,4 +30,5 @@
     'KorAPCorpusStats.R'
     'RKorAPClient.R'
     'KorAPQuery.R'
+    'ci.R'
     'reexports.R'