Revert "Do not send box update emails to admins"

This reverts commit 865b041474.

src/updatechecker.js

@@ -198,6 +198,24 @@ function checkBoxUpdates(callback) {
 
             gBoxUpdateInfo = updateInfo;
 
+            // decide whether to send email
+            var state = loadState();
+
+            if (state.box === gBoxUpdateInfo.version) {
+                debug('Skipping notification of box update as user was already notified');
+                return callback();
+            }
+
+            if (semver.satisfies(gBoxUpdateInfo.version, '~' + config.version())) {
+                debug('Skipping notification of box update as this is a patch release');
+            } else {
+                mailer.boxUpdateAvailable(updateInfo.version, updateInfo.changelog);
+            }
+
+            state.box = updateInfo.version;
+
+            saveState(state);
+
             callback();
         });
     });