Remove purrr dependency

Change-Id: If9a1e4e85aaa1055523617015cedd50ce858ca30
diff --git a/DESCRIPTION b/DESCRIPTION
index 2c2899b..3966a63 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -35,7 +35,6 @@
     magrittr,
     tidyr,
     dplyr,
-    purrr,
     lubridate,
     highcharter,
     jsonlite,