Minor - update yarn libs

package.json

@@ -44,7 +44,6 @@
     "mathjax": "^2.7",
     "mediaelement": "^4.2",
     "mediaelement-plugins": "https://github.com/chamilo/mediaelement-plugins",
-    "xcolor": "https://github.com/infusion/jQuery-xcolor",
     "moment": "^2.22",
     "multiselect-two-sides": "^2.5.5",
     "mxgraph": "^4.0",
@@ -61,6 +60,7 @@
     "timepicker": "^1.11.14",
     "uglifyjs-webpack-plugin": "^1.3.0",
     "webcamjs": "^1.0",
-    "webpack-jquery-ui": "^2.0.1"
+    "webpack-jquery-ui": "^2.0.1",
+    "xcolor": "https://github.com/infusion/jQuery-xcolor"
   }
 }