Merge pull request #13829 from BBosman/preserve

Always use preserveComment: 'some'

Gruntfile.js

@@ -110,17 +110,14 @@ module.exports = function (grunt) {
     },
 
     uglify: {
-      bootstrap: {
       options: {
-          banner: '<%= banner %>'
+        preserveComments: 'some'
       },
+      bootstrap: {
         src: '<%= concat.bootstrap.dest %>',
         dest: 'dist/js/<%= pkg.name %>.min.js'
       },
       customize: {
-        options: {
-          preserveComments: 'some'
-        },
         src: [
           'docs/assets/js/_vendor/less.min.js',
           'docs/assets/js/_vendor/jszip.min.js',
@@ -133,9 +130,6 @@ module.exports = function (grunt) {
         dest: 'docs/assets/js/customize.min.js'
       },
       docsJs: {
-        options: {
-          preserveComments: 'some'
-        },
         src: [
           'docs/assets/js/_vendor/holder.js',
           'docs/assets/js/_vendor/ZeroClipboard.min.js',