Update description to add sf.

sarah-colq · sarah-colq · commit cdf7f557f6d5 · 2020-10-30T16:10:56.000-04:00
diff --git a/R-packages/covidcast/DESCRIPTION b/R-packages/covidcast/DESCRIPTION
@@ -28,7 +28,8 @@ Imports:
   maptools,
   ggplot2,
   grDevices,
-  rlang
+  rlang,
+  sf
 RoxygenNote: 7.1.1
 Suggests: 
     knitr,
