Remove redundant htmlwidgets imports

Change-Id: I2c4d1352c5daabf3092613206f420132d9d7322a
diff --git a/DESCRIPTION b/DESCRIPTION
index 900f120..0981d3e 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -43,7 +43,6 @@
     highcharter,
     jsonlite,
     keyring,
-    htmlwidgets,
     utils,
     httr,
     methods,
diff --git a/demo/regional.R b/demo/regional.R
index 9480d67..f056d58 100755
--- a/demo/regional.R
+++ b/demo/regional.R
@@ -3,7 +3,6 @@
 library(ggplot2)
 library(raster)
 library(broom)
-library(htmlwidgets)
 
 devAskNewPage(ask = FALSE)
 mapfile <- "demo/data/cache/map-v2.rds"