Change UMD global name

Author: markerikson

tsdx.config.js

@@ -7,7 +7,7 @@ const pkg = require('./package.json')
 
 module.exports = {
   rollup(config, options) {
-    config.output.name = 'RSK'
+    config.output.name = 'RTK'
     const { env, format } = options
     // eslint-disable-next-line default-case
     switch (format) {