Grunt don't delete version.json

Author: limzykenneth

Gruntfile.js

@@ -310,7 +310,7 @@ module.exports = function(grunt) {
     clean: {
       assets: [
         '<%= config.dist %>/**/*.*',
-        '!<%= config.dist %>/download/release.php',
+        '!<%= config.dist %>/download/version.json',
         '!<%= config.dist %>/git-pull.php',
         '!<%= config.dist %>/books/media.zip',
         '!<%= config.dist %>/learn/books/media.zip',