Update DESCRIPTION and NAMESPACE

Author: Jake Conway

DESCRIPTION

@@ -26,4 +26,4 @@ LazyData: true
 VignetteBuilder: knitr
 Suggests:
     knitr
-RoxygenNote: 6.0.1
+RoxygenNote: 6.1.0

NAMESPACE

@@ -1,6 +1,7 @@
 # Generated by roxygen2: do not edit by hand
 
 S3method(print,upset)
+S3method(summary,upset)
 export(elements)
 export(fromExpression)
 export(fromList)
@@ -18,7 +19,7 @@ import(utils)
 importFrom(grid,gpar)
 importFrom(grid,grid.draw)
 importFrom(grid,grid.layout)
-importFrom(grid,grid.null)
+importFrom(grid,grid.newpage)
 importFrom(grid,legendGrob)
 importFrom(grid,popViewport)
 importFrom(grid,pushViewport)