Add matchStart and matchEnd columns to collectedMatches in corpusQuery result

Resolves #22

Change-Id: I6af9de503e5911cbe5c566b0fae529cfba7b764c
diff --git a/NAMESPACE b/NAMESPACE
index 42fe68e..534fbd3 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -109,6 +109,7 @@
 importFrom(stringr,str_detect)
 importFrom(stringr,str_match)
 importFrom(stringr,str_split)
+importFrom(stringr,word)
 importFrom(tibble,add_column)
 importFrom(tibble,as_tibble)
 importFrom(tibble,enframe)