[build] Append grunt-contrib-htmlmin as dependence.

apps/documenteditor/mobile/app-dev.js

@@ -219,7 +219,6 @@ require([
         'documenteditor/mobile/app/controller/add/AddShape',
         'documenteditor/mobile/app/controller/add/AddImage',
         'documenteditor/mobile/app/controller/add/AddOther'
-
     ], function() {
         app.start();
     });

build/documenteditor.json

 {
     "name": "documenteditor",
     "version": "4.7.0",
-    "build": 1110,
+    "build": 1112,
     "homepage": "http://www.onlyoffice.com",
     "private": true,
     "sdk": {

build/package.json

@@ -21,6 +21,7 @@
     "grunt-contrib-concat": "^0.5.1",
     "grunt-contrib-imagemin": "^1.0.0",
     "grunt-contrib-cssmin": "^0.12.2",
+    "grunt-contrib-htmlmin": "^2.0.0",
     "vinyl-fs": "2.2.1",
     "less-plugin-clean-css": "1.5.0"
   }