feature: display username in provider view

by @ifedapoolarewaju, got removed in PR merges/rebases somehow

https://github.com/transloadit/uppy/commit/c027e49aa5d22fb20131fa78bf735ff3c5ef954b#commitcomment-29076740

src/views/ProviderView/Browser.js

@@ -21,11 +21,12 @@ const Browser = (props) => {
       <div class="uppy-ProviderBrowser-header">
         <div class={classNames('uppy-ProviderBrowser-headerBar', !props.showBreadcrumbs && 'uppy-ProviderBrowser-headerBar--simple')}>
           <div class="uppy-Provider-breadcrumbsIcon">{props.pluginIcon && props.pluginIcon()}</div>
-          {props.showBreadcrumbs && <Breadcrumbs
-            getFolder={props.getFolder}
-            directories={props.directories}
-            title={props.title} />
-          }
+          {props.showBreadcrumbs && Breadcrumbs({
+            getFolder: props.getFolder,
+            directories: props.directories,
+            title: props.title
+          })}
+          <span class="uppy-ProviderBrowser-user">{props.username}</span>
           <button type="button" onclick={props.logout} class="uppy-ProviderBrowser-userLogout">
             {props.i18n('logOut')}
           </button>