Add convenience bindings for ggplot2 and plotly with hyperlinks

These functions will probably be moved to a separate package.

Change-Id: Iaecd23b1401bc5df7ee4a904dca2e87466266143
diff --git a/DESCRIPTION b/DESCRIPTION
index 5e2ddf4..6faf7ee 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -22,6 +22,8 @@
     lubridate,
     curl,
     jsonlite,
+    plotly,
+    htmlwidgets,
     utils,
     httr,
     methods