migrate to reveal 3.2; add tests for all themes
diff --git a/DESCRIPTION b/DESCRIPTION
index 18c2e81..ec84233 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -11,3 +11,5 @@
     R (>= 3.0)
 Imports:
     rmarkdown(>= 0.3.3)
+Suggests:
+    testthat