Added Internet Archive mirror link for 'Class-based NewtonScript Programming' per issue #45

Author: morgant

index.html

@@ -316,6 +316,7 @@ <h2 id="docs">Documentation</h2>
 				<ul class="metadata">
 					<li>Author: <a href="http://waltersmith.us/">Walter Smith</a></li>
 					<li>Format: PDF</li>
+					<li>Mirror: <a href="http://web.archive.org/web/20180304194339/http://waltersmith.us/newton/Class-based%20NewtonScript%20Programming.pdf">Internet Archive</a></li>
 				</ul>
 			</dd>