Added Internet Archive mirror link for 'Newton Formats errata' per issue #45

Author: morgant

index.html

@@ -493,6 +493,7 @@ <h2 id="docs">Documentation</h2>
 				<ul class="metadata">
 					<li>Author: <a href="http://matejhorvat.si/en/">Matej Horvat</a></li>
 					<li>Format: HTML</li>
+					<li>Mirror: <a href="https://web.archive.org/web/20190415082721/http://matejhorvat.si/en/ns/nferrata.htm">Internet Archive</a></li>
 				</ul>
 			</dd>