add TODO item regarding clean-css v3.2 & zeroUnits

Refs https://github.com/twbs/bootstrap/issues/14837#issuecomment-77441999

diff --git a/Gruntfile.js b/Gruntfile.js
index c5f252684df68a0f6448ed3bed06b924f60a0f60..fe9eb323590f453e517a88fd4aba5e5b80c02863 100644 (file)
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -223,6 +223,8 @@ module.exports = function (grunt) {
 
     cssmin: {
       options: {
+        // TODO: disable `zeroUnits` optimization once clean-css 3.2 is released
+        //    and then simplify the fix for https://github.com/twbs/bootstrap/issues/14837 accordingly
         compatibility: 'ie8',
         keepSpecialComments: '*',
         advanced: false