update roxygen2
diff --git a/NAMESPACE b/NAMESPACE
index 52d1605..10d60c6 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -1,4 +1,4 @@
-# Generated by roxygen2 (4.1.0): do not edit by hand
+# Generated by roxygen2 (4.1.1): do not edit by hand
 
 export(revealjs_presentation)
 import(rmarkdown)