add "view release changes" button below the update available banner

src/app/components/Header.jsx

@@ -505,6 +505,9 @@ export default class Header extends TranslatedComponent {
     return (
       <header>
         {this.props.appCacheUpdate && <div id="app-update" onClick={() => window.location.reload() }>{translate('PHRASE_UPDATE_RDY')}</div>}
+        {this.props.appCache ? <a className={"view-changes"} href={"https://github.com/EDCD/coriolis/compare/edcd:develop@{" + window.CORIOLIS_DATE + "}...edcd:develop"} target="_blank">
+          {"View Release Changes"}
+        </a> : null}
         <Link className='l' href='/' style={{ marginRight: '1em' }} title='Home'><CoriolisLogo className='icon xl' /></Link>
 
         <div className='l menu'>