Add helper for using highcharter / Highcharts more easily

Change-Id: I9c4d501aebcc31cf997ef4e572d107a4aa083325
diff --git a/DESCRIPTION b/DESCRIPTION
index 9f0b936..c47825f 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -9,7 +9,7 @@
 License: BSD_2_clause + file LICENSE
 Encoding: UTF-8
 LazyData: false
-RoxygenNote: 7.0.1
+RoxygenNote: 7.0.2
 Imports:
     R.cache,
     broom,
@@ -21,6 +21,7 @@
     purrr,
     lubridate,
     curl,
+    highcharter,
     jsonlite,
     keyring,
     plotly,
@@ -35,5 +36,6 @@
     'RKorAPClient.R'
     'KorAPQuery.R'
     'ci.R'
+    'highcharter-helper.R'
     'misc.R'
     'reexports.R'