Rename "api token" to "access token"

Change-Id: I56f7566aae8c6aa11c13e3e07d2535d8748c60e4
diff --git a/NAMESPACE b/NAMESPACE
index 5c5f350..404af0c 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -20,7 +20,7 @@
 exportClasses(KorAPCorpusStats)
 exportClasses(KorAPQuery)
 exportMethods(apiCall)
-exportMethods(clearApiToken)
+exportMethods(clearAccessToken)
 exportMethods(clearCache)
 exportMethods(corpusQuery)
 exportMethods(corpusStats)
@@ -29,7 +29,7 @@
 exportMethods(fetchRest)
 exportMethods(frequencyQuery)
 exportMethods(initialize)
-exportMethods(persistApiToken)
+exportMethods(persistAccessToken)
 exportMethods(show)
 import(R.cache)
 import(httr)