add Webdev Newsletter

Author: vinhnx

README.md

@@ -65,6 +65,7 @@
     + [Sidebar.io](http://sidebar.io/) The 5 best design links, everyday
     + [Web Design Weekly](http://web-design-weekly.com/)
     + [Web Development Reading List](http://wdrl.helloanselm.com/)
+    + [Webdev Newsletter](http://www.d.umn.edu/itss/training/online/webdesign/webdev_listserv.html)
     + [Open Web Platform Daily Digest](http://webplatformdaily.org)
     + [Responsive Design Newsletter](http://responsivedesignweekly.com/)
     + [echo.js](http://www.echojs.com/): Reddit-like Website for JavaScript Resources