update jquery to v3.5.1

Author: adumesny

README.md

@@ -337,7 +337,7 @@ Recommend looking at the [many samples](./demo) for more code examples.
 
 ### jQuery Application
 
-We're working on implementing HTML5 drag'n'drop through the plugin system. Right now it is still jquery-ui based. Because of that we are still bundling `jquery` (3.4.1) + `jquery-ui` (1.12.1 minimal drag|drop|resize) internally in `gridstack.all.js`. IFF your app needs to bring it's own version instead, you should **instead** include `gridstack-poly.min.js` (optional IE support) + `gridstack.min.js` + `gridstack.jQueryUI.min.js` after you import your libs.
+We're working on implementing HTML5 drag'n'drop through the plugin system. Right now it is still jquery-ui based. Because of that we are still bundling `jquery` (3.5.1) + `jquery-ui` (1.12.1 minimal drag|drop|resize) internally in `gridstack.all.js`. IFF your app needs to bring it's own version instead, you should **instead** include `gridstack-poly.min.js` (optional IE support) + `gridstack.min.js` + `gridstack.jQueryUI.min.js` after you import your libs.
 
 Changes
 =====

doc/CHANGES.md

@@ -38,6 +38,7 @@ Change log
 
 - fix [1311](https://github.com/gridstack/gridstack.js/issues/1311) domAttr is not defined
 - adds `styleInHead` option to allow for selecting older behavior (adding STYLE element to HEAD element instead of parentNode)
+- update jquery to v3.5.1
 
 ## 1.1.2 (2020-05-17)