remove screenshots link

The screenshots on the page were broken

README.md

@@ -9,5 +9,5 @@ The application has been running in production for us for nearly 6 months and we
 * [Read all documentation](https://github.com/atech/postal/wiki)
 * [Quick install guide](https://github.com/atech/postal/wiki/Quick-Install)
 * [Installation docs](https://github.com/atech/postal/wiki/Installation)
-* [FAQs](https://github.com/atech/postal/wiki/FAQs), [Features](https://github.com/atech/postal/wiki/Features) & [Screenshots](https://github.com/atech/postal/wiki/Screenshots)
+* [FAQs](https://github.com/atech/postal/wiki/FAQs) & [Features](https://github.com/atech/postal/wiki/Features)
 * [Google Group](https://groups.google.com/forum/#!forum/postal-talk) - for support, questions or comments.