open: associate .png with ristretto

diff --git a/open b/open
index 0cb549a..c75829d 100755 (executable)
--- a/open
+++ b/open
@@ -24,6 +24,7 @@ for f in "$@"; do
         *.gif) openwith "${f}" ristretto;;
         *.jpg) openwith "${f}" ristretto;;
         *.pdf) openwith "${f}" evince;;
+        *.png) openwith "${f}" ristretto;;
         *) openwith "${f}";;
     esac
 done