support array in chalkboard reveal_options (#88)

fixes #62

Co-authored-by: christophe dervieux <christophe.dervieux@gmail.com>
diff --git a/.Rbuildignore b/.Rbuildignore
index b97bfda..21b0514 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -9,4 +9,5 @@
 ^_pkgdown\.yml$
 ^reference$
 ^pkgdown$
-vignettes/
\ No newline at end of file
+vignettes/
+^tests/manual$