open: associate .gif with ristretto

diff --git a/open b/open
index f2b8f05..0cb549a 100755 (executable)
--- a/open
+++ b/open
@@ -21,6 +21,7 @@ openwith() {
 # Determine what command to run based on file extension.
 for f in "$@"; do
     case ${f,,} in
+        *.gif) openwith "${f}" ristretto;;
         *.jpg) openwith "${f}" ristretto;;
         *.pdf) openwith "${f}" evince;;
         *) openwith "${f}";;