add 'long' to snapshot success

Author: timelyportfolio

src/components/modebar/buttons.js

@@ -59,7 +59,7 @@ modeBarButtons.toImage = {
 
         downloadImage(gd)
           .then(function(filename) {
-              Lib.notifier('Snapshot succeeded - ' + filename);
+              Lib.notifier('Snapshot succeeded - ' + filename, 'long');
           })
           .catch(function() {
               Lib.notifier('Sorry there was a problem downloading your snapshot', 'long');