fix(webview): add missing redux type

Author: mtaberna

src/renderer/middlewares/Webviews/types.js

@@ -5,3 +5,5 @@ export const RELOAD_WEBVIEW = 'WEBVIEWS/RELOAD_WEBVIEW';
 export const HIDE_WEBVIEWS = 'WEBVIEWS/HIDE_WEBVIEWS';
 
 export const WEBVIEW_ERROR = 'WEBVIEWS/WEBVIEW_ERROR';
+
+export const UPDATE_UNREAD_EMAILS = 'WEBVIEWS/UPDATE_UNREAD_EMAILS';