Update
diff --git a/.Rbuildignore b/.Rbuildignore
index 7b93970..5219fdf 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -1,2 +1,3 @@
 ^.*\.Rproj$
 ^.*\.Rproj\.user$
+^\.Rproj\.user$