Umd build 1.8.1

Hi @tommy, thanks for looking at this.

look at these files:

the CDN one: https://source.zoom.us/zoom-meeting-1.8.1.min.js
first line: // [Zoom Meeting Web Client WebSDK] 1.8.1_20200921_ES5_release - Monday, September 21st, 2020, 9:42:28 AM

the NPM one installed with npm install @zoomus/websdk@1.8.1: node_modules/@zoomus/websdk/dist/zoomus-websdk.umd.min.js
first line: // [Zoom Meeting Web Client WebSDK] 1.8.1_20200921_ES6_release - Monday, September 21st, 2020, 10:06:48 AM

This comment in itself is not a problem, but if you link this file without using a transpiler, javascript will choke because apart from being ES6, the NPM code relies on things like “require”, not really browser friendly

I plan to use the websdk in a single web page, and using npm will assure me of being up-to-date, but I think a UMD file should be used without needing to be transpiled to be used.

single steps to reproduce: just put this into a html page (after installing with npm of course):

<script src="node_modules/react/umd/react.production.min.js"></script>
<script src="node_modules/react-dom/umd/react-dom.production.min.js"></script>
<script src="node_modules/redux/dist/redux.min.js"></script>
<script src="node_modules/redux-thunk/dist/redux-thunk.min.js"></script>
<script src="node_modules/jquery/dist/jquery.min.js"></script>
<script src="node_modules/lodash/lodash.min.js"></script>
<script src="node_modules/@zoomus/websdk/dist/zoomus-websdk.umd.min.js"></script>