Kludge to work around https://github.com/signalapp/Signal-Desktop/issues/2376.
--- Gruntfile.js.orig	2018-05-15 01:57:11.000000000 +0200
+++ Gruntfile.js	2018-05-20 19:15:45.054357251 +0200
@@ -511,6 +511,5 @@
     'concat',
     'copy:deps',
     'sass',
-    'date',
   ]);
 };